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Celltech Group PLC (CCH) - Offer for Oxford GlycoScience
Celltech Group PLC
26 February 2003




                                                                26 February 2003

                        CELLTECH GROUP PLC ('CELLTECH')

                CASH OFFER FOR OXFORD GLYCOSCIENCES PLC ('OGS')

Summary:


  • The board of Celltech announces the terms of a cash offer for the entire
    issued, and to be issued, share capital of OGS.

  • The Offer will be 182 pence in cash for each OGS Share, valuing the entire
    issued share capital of OGS at approximately £101.4 million.

  • The Offer is substantially earnings and cash neutral for Celltech.

Rationale for the Offer:


  • Celltech believes that its cash offer represents an opportunity to acquire
    important tangible and intangible assets that it can harness into its
    extensive R&D capabilities.

  • Celltech believes that, using its various antibody and small molecule
    technology platforms, it has the ability to exploit certain novel protein
    disease targets identified and patented by OGS. In addition, Celltech
    believes that the integration of OGS' bio-informatics capabilities will
    expand its own capabilities in this area. Zavesca, OGS' licensed product for
    the treatment of mild to moderate Type I Gaucher disease, will generate a
    future income stream that will be of value to Celltech.

  • Further, Celltech believes that its cash offer represents a significant
    premium to the value of Cambridge Antibody Technology Group plc's ('CAT')
    share offer, announced on 23 January 2003. The proposed transaction between
    CAT and OGS valued each OGS share at 148.5 pence as at the close of business
    on 25 February 2003. This equates to a valuation for OGS of £82.8 million
    against a value of OGS on 22 January 2003 (the last UK Business Day before
    the announcement by CAT and OGS of their agreed merger) of £85.0 million.

  • Celltech has previously indicated to its shareholders that, since its
    existing business is cash generative, it does not need to raise funds for
    existing operations or for small product or technology acquisitions. In
    keeping with this philosophy, and to avoid any dilution for its existing
    shareholders, Celltech is offering cash for each OGS share, funded from its
    existing cash resources and credit facilities.

The Offer represents:


  • An additional 29.5p per OGS Share, equivalent to a premium of
    approximately 19.3 per cent. over 152.5p, being the Closing Price of an OGS
    Share on 22 January 2003, the last UK Business Day prior to the announcement
    by CAT and OGS of their agreed merger.

  • An additional 35p per OGS Share, equivalent to a premium of approximately
    23.8 per cent. over 147p, being the 10-day volume weighted average trading
    price of an OGS Share on 22 January 2003, the last UK Business Day prior to
    the announcement by CAT and OGS of their agreed merger.

  • An additional 33.5p per OGS Share, equivalent to a premium of
    approximately 22.6 per cent. over 148.5p, being the implied value of an OGS
    Share under the CAT merger offer on 25 February 2003, the last UK Business
    Day prior to the announcement by Celltech of the Offer.

Financial effects on Celltech:


  • Celltech plans to undertake a rapid integration of OGS, which is expected
    to be substantially complete in the second half of 2003. The financial
    impact on Celltech's earnings profile is anticipated to be negligible.

 Dr Peter Fellner, Chief Executive of Celltech, commented:

'We believe that Celltech is well placed to extract value from the acquisition
of OGS due to the complementarity of activities, Celltech's management
experience and its successful track record in integrating acquisitions. This
represents a cash neutral acquisition of important assets for Celltech. Our
integration plans are being formulated and we anticipate minimal impact on
Celltech's operating earnings.'



This summary should be read in conjunction with the full text of the following
announcement about the Offer.

The Offer Document and the Acceptance Forms
accompanying the Offer Document will be made available to all OGS
Securityholders at no charge to them. OGS Securityholders are advised to read
the Offer Document and the accompanying Acceptance Forms when they are sent to
them because they will contain important information. OGS Securityholders in the
US are also advised to read the Tender Offer Statement because it will contain
important information.

Unless otherwise determined by Celltech and permitted by applicable law and
regulation, the Offer (including the Loan Note Alternative) will not be made,
directly or indirectly, in or into, or by use of the mails of, or by any other
means or instrumentality (including, without limitation, telephonically or
electronically) of interstate or foreign commerce of, or of any facility of a
national securities exchange of Canada, nor will it be made in or into Australia
or Japan and the Offer will not be capable of acceptance by any such use, means,
instrumentality or facilities or from within Australia, Canada or Japan.
Accordingly, unless otherwise determined by Celltech and permitted by applicable
law and regulation, neither copies of this announcement nor any other documents
relating to the Offer are being, or may be, mailed or otherwise forwarded,
distributed or sent in or into Australia, Canada or Japan and persons receiving
such documents (including custodians, nominees and trustees) must not distribute
or send them in, into or from such jurisdictions.

The Loan Notes to be issued pursuant to the Loan Note Alternative have not been,
and will not be, listed on any stock exchange and have not been and will not be
registered under the US Securities Act or under any relevant securities laws of
any state or other jurisdiction of the United States, or under the relevant
securities laws of Australia, Canada or Japan or any other jurisdiction.
Accordingly, unless an exemption under such relevant laws is available, Loan
Notes may not be offered, sold, re-sold or delivered, directly or indirectly,
in, into or from the United States, Australia, Canada or Japan or any other
jurisdiction in which an offer of Loan Notes would constitute a violation of
relevant laws or require registration of the Loan Notes, or to or for the
account or benefit of any US Person or resident of Australia, Canada or Japan or
any other such jurisdiction.

JPMorgan is acting for Celltech and for no one else in connection with the Offer
and will not be responsible to anyone other than Celltech for providing the
protections afforded to customers of JPMorgan or for providing advice in
relation to the Offer.

The Panel wishes to draw the attention of member firms of NASDAQ to certain UK
dealing disclosure requirements during the offer period. The offer period (in
accordance with the City Code, which is published and administered by the Panel)
commences at the time when an announcement is made of a proposed or possible
offer, with or without terms. OGS has equity securities traded on the London
Stock Exchange and NASDAQ.

The above disclosure requirements are set out in more detail in Rule 8 of the
City Code. In particular, Rule 8 requires public disclosure of dealings during
the offer period by persons who own or control, or who would as a result of any
transaction own or control, one per cent. or more of any class of relevant
securities of the offeree company. Relevant securities include OGS Shares, OGS
ADSs and instruments convertible into OGS Shares or OGS ADSs. This requirement
will apply until the first closing date or, if this is later, the date when the
Offer becomes or is declared unconditional or lapses.

Disclosure should be made on an appropriate form by no later than 12 noon London
time (7 a.m. New York City time) on the business day following the date of the
dealing transaction. These disclosures should be published through a Regulatory
Information Service.

The Panel requests that member firms advise those of their clients who wish to
deal in the relevant securities of OGS, whether in the United States or in the
UK, that they may be affected by these requirements. If there is any doubt as to
their application the Panel should be consulted (telephone number: +44 (0) 20
7382 9026, fax number: +44 (0) 20 7638 1554).

This announcement contains certain 'forward-looking' statements which are
naturally subject to uncertainty and changes in circumstances. Actual results
may vary materially from the expectations contained in this announcement. The
forward-looking statements contained in this announcement include statements
about the feasibility and benefits of the acquisition of OGS by Celltech.
Factors that would cause actual results to differ materially from those
described in this announcement include: the inability to obtain necessary
regulatory approvals or to obtain them on acceptable terms; the inability
successfully to integrate OGS within the Celltech Group or to realise synergies
from such integration; costs related to the acquisition of OGS; the economic
environment of the industries in which Celltech and OGS operate; the general
economic environment; and other risk factors detailed in OGS' and Celltech's
filings with the SEC.

This announcement has been approved by JPMorgan for the purpose of section 21 of
the Financial Services and Markets Act 2000 only.




                                                                26 February 2003

                        CELLTECH GROUP PLC ('CELLTECH')

                CASH OFFER FOR OXFORD GLYCOSCIENCES PLC ('OGS')


 1. Introduction

    The board of Celltech announces the terms of a cash offer for the entire
    issued, and to be issued, share capital of OGS. The Offer is to be made by
    Celltech and (outside the United States) JPMorgan on its behalf and is
    subject to the applicable requirements of the City Code and US federal
    securities laws, subject to customary exemptions granted by the SEC in
    relation to the Offer.

    The Offer will be 182 pence in cash for each OGS Share, valuing the entire
    issued share capital of OGS at approximately £101.4 million.

 2. The Offer

    The Offer, which will be subject to the conditions and further terms set out
    in Appendix I and to be set out in the Offer Document and Acceptance Forms,
    will be made on the following basis:

    for each OGS Share (including those represented by OGS ADSs) 182 pence in
    cash

    This represents 182 pence in cash per OGS ADS (each OGS ADS representing one
    OGS Share).

    The OGS Shares (including those represented by OGS ADSs) which are the
    subject of the Offer will be acquired by Celltech pursuant to the Offer
    fully paid and free from all liens, charges, equitable interests, third
    party rights and interests and encumbrances and together with all rights now
    or hereafter attaching thereto, including the right to receive all dividends
    and other distributions (if any) declared, made or paid after the date of
    this announcement.

    The Offer extends to any OGS Shares (including those represented by OGS
    ADSs) which are unconditionally allotted or issued prior to the date on
    which the Offer closes (or such earlier date, not being earlier than the
    date on which the Offer becomes or is declared wholly unconditional, as
    Celltech may, subject to the City Code, decide) as a result of the exercise
    of options or rights granted under the OGS Share Option Schemes or
    otherwise.

 3. Premium

    The Offer represents:

    an additional 29.5p per OGS Share, equivalent to a premium of approximately
    19.3 per cent. over 152.5p, being the Closing Price of an OGS Share on 22
    January 2003, the last UK Business Day prior to the announcement by
    Cambridge Antibody Technology Group plc ('CAT') and OGS of their agreed
    merger

    an additional 35.0p per OGS Share, equivalent to a premium of approximately
    23.8 per cent. over 147p, being the 10-day volume weighted average trading
    price of an OGS Share on 22 January 2003, the last UK Business Day prior to
    the announcement by CAT and OGS of their agreed merger

    an additional 33.5p per OGS Share, equivalent to a premium of approximately
    22.6 per cent. over 148.5p, being the implied value of an OGS Share under
    the CAT merger offer, on 25 February 2003, the last UK Business Day prior to
    the announcement by Celltech of the Offer

 4. Background to and reasons for the Offer

    Celltech believes that its cash offer represents an opportunity to acquire
    important tangible and intangible assets that it can harness into its
    extensive R&D capabilities.

    Celltech believes that, using its various antibody and small molecule
    technology platforms, it has the ability to exploit certain novel protein
    disease targets identified and patented by OGS. In addition, Celltech
    believes that the integration of OGS' bio-informatics capabilities will
    expand its own capabilities in this area. Zavesca, OGS' licensed product for
    the treatment of mild to moderate Type I Gaucher disease, will generate a
    future income stream that will be of value to Celltech.

    Further, Celltech believes that its cash offer represents a significant
    premium to the value of CAT's share offer, announced on 23 January 2003. The
    proposed transaction between CAT and OGS values each OGS share at 148.5
    pence as at the close of business on 25 February 2003. This equates to a
    valuation for OGS of £82.8 million against a value of OGS on 22 January 2003
    (the last UK Business Day before the announcement by CAT and OGS of their
    agreed merger) of £85.0 million.

    Celltech has previously indicated to its shareholders that, since its
    existing business is cash-generative, it does not need to raise funds for
    existing operations or small product or technology acquisitions. In keeping
    with this philosophy, and to avoid any dilution for its existing
    shareholders, Celltech is offering 182 pence in cash for each OGS Share
    (including those represented by OGS ADSs), equating to a valuation for OGS
    of £101.4 million.

 5. Financial effects on Celltech

    Celltech plans to undertake a rapid integration of OGS, which is expected to
    be substantially complete in the second half of 2003. The financial impact
    on Celltech's earnings profile is anticipated to be negligible.

 6. The Loan Note Alternative

    OGS Securityholders (other than certain overseas OGS Securityholders) who
    validly accept the Offer will be able to elect to receive Loan Notes instead
    of some or all of the cash to which they would otherwise become entitled
    under the terms of the Offer. The Loan Note Alternative will be available on
    the following basis:

    for every £1 in cash consideration           £1 nominal of Loan Notes

    The Loan Notes, which will be governed by English law, will be unsecured and
    will be issued credited as fully paid in amounts and integral multiples of
    £1 nominal value. All fractional entitlements to the Loan Notes will be
    disregarded. No application will be made for the Loan Notes to be listed or
    dealt in or on any stock exchange but they shall be transferable subject to
    certain restrictions to be set out in the instrument constituting the Loan
    Notes.

    The Loan Notes will carry interest at 0.5 per cent. below LIBOR. Interest
    will be payable by half-yearly instalments in arrears (less any tax) on 30
    June and 31 December in each year, except that the first payment of interest
    will be made on the date (the 'First Interest Payment Date') which is the
    first 30 June or 31 December to fall on or after the date which is six
    months after the first date of issue of any of the Loan Notes. On the First
    Interest Payment Date, interest will be paid in respect of the period from
    (and including) the first date of issue of any of the Loan Notes to (but
    excluding) the First Interest Payment Date. The Loan Notes will be
    redeemable in whole or in part for cash at the option of holders on the
    First Interest Payment Date and subsequent interest payment dates. In
    certain circumstances (to be set out in the instrument constituting the Loan
    Notes), Celltech will have the right to redeem all of the Loan Notes. The
    final redemption date will be the fifth anniversary of the First Interest
    Payment Date.

    No Loan Notes will be issued unless, on or before the date on which the
    Offer becomes or is declared unconditional in all respects, valid elections
    have been received in respect of at least £10 million in nominal value of
    Loan Notes. If insufficient elections are received, Celltech reserves the
    right to choose, for those OGS Securityholders electing for the Loan Note
    Alternative, whether to honour those elections received or to settle in cash
    in accordance with the terms of the Offer.

    Subject as aforesaid, the Loan Note Alternative will remain open for
    acceptance for as long as the Offer remains open for acceptance. The Loan
    Note Alternative is conditional upon the Offer becoming or being declared
    unconditional in all respects.

    Further details of the Loan Notes will be included in the Offer Document.
    OGS Securityholders who are not resident in the United Kingdom should refer
    to paragraph 13 below.

 7. Information on the Celltech Group

    Celltech is a leading European biotechnology company, with an extensive late
    stage development pipeline and a profitable, cash-generative pharmaceutical
    business. Celltech also possesses significant drug discovery and development
    capabilities, including a world-leading antibody technology platform and
    extensive medicinal chemistry capabilities.

    Celltech is pursuing an R&D-centred strategy, where it aims to build
    long-term shareholder value by bringing first-in-class or best-in-class
    products to market, with its substantial investment in R&D of some £100
    million per annum being sustained by revenues from its pharmaceutical
    business and royalty streams. Celltech is focused upon maximising the value
    retained from its innovative development programmes whilst minimising risk.
    This approach includes partnering for strength, where Celltech retains
    co-promotion rights, profit-sharing arrangements and enhanced royalties.
    These commercialisation arrangements include the marketing of certain
    specialist-focused products using Celltech's own salesforce. Celltech has
    product collaborations with leading pharmaceutical and biotechnology
    companies including Amgen, AstraZeneca, Biogen, Bristol-Myers Squibb,
    Johnson & Johnson, Merck, Pharmacia and Wyeth.

    For the year ended 31 December 2001, the Celltech Group reported a profit
    before taxation and goodwill amortisation of £47.8 million (loss of £56.2
    million after goodwill amortisation) on turnover of £303.1 million. The
    Celltech Group had net assets as at that date of £619.2 million. As at close
    of business on 25 February 2003, Celltech had a market capitalisation of
    £892.1 million.

 8. Information on OGS

    OGS is a research and product development company with three distinct
    business units - Inherited Storage Disorders (ISD), proteomics and oncology.
    In ISD, its most advanced product is ZavescaTM, which has been approved by
    the European Commission for the treatment of mild to moderate Type I Gaucher
    disease in patients for whom enzyme replacement therapy is unsuitable. Under
    the terms of a marketing and distribution agreement, Actelion will market
    Zavesca worldwide with the exception of Israel. European launch is expected
    in March 2003. An amended New Drug Application is expected to be filed with
    the FDA in the first quarter of 2003. In Israel Zavesca will be marketed by
    Teva, who filed for approval in January 2003. Zavesca is also undergoing
    further clinical investigations in other glycosphineal storage disorders.
    Another ISD compound is OGT 923, which has entered Phase I clinical trials.

    OGS has a leading proteomics business which has several collaborations with
    partners including Bayer, GSK, Pfizer, Pioneer Hi-Bred/DuPont and Wyeth. In
    addition it has a joint venture, Confirmant Limited, to develop the protein
    atlas of the human genome. OGS receives royalties for licensing its
    intellectual property in proteomics.

    In oncology, OGS is developing a pipeline of projects and has drug discovery
    and development alliances with Medarex and BioInvent and a drug discovery
    alliance with NeoGenesis. OGS currently has five discovery products in
    oncology.

    OGS completed its initial public offering and listing on the London Stock
    Exchange in April 1998, raising approximately £27.8 million. In March 2000,
    OGS raised approximately £32.9 million and in December raised a further
    £157.4 million in secondary offerings. In December 2000, the OGS ADSs
    commenced trading on NASDAQ.

    For the year ended 31 December 2001, OGS reported a loss before taxation of
    £28.2 million on turnover of approximately £13.4 million. OGS had net assets
    as at that date of approximately £194.6 million, with net cash of
    approximately £176.6 million. On the basis of the Closing Price of an OGS
    Share of 152.5 pence on 22 January 2003, the last UK Business Day prior to
    the date of the announced merger with CAT, OGS' market capitalisation was
    approximately £85.0 million. As at 31 December 2002, OGS had net cash of
    approximately £136.4 million.

 9. Management and employees

    The Celltech Board confirms that the existing contractual employment rights,
    including pension rights, of the management and employees of the OGS Group
    will be fully safeguarded following completion of the Offer.

10. Financing

    The Offer will be funded from Celltech's existing cash resources and credit
    facilities. As of 31 December 2002, Celltech had cash and liquid resources
    of £105.1 million, offset by £31.2 million in loan notes, and has committed
    3 year credit facilities of £65 million available from a syndicate of banks.
    JPMorgan has confirmed that resources are available to Celltech sufficient
    to satisfy full acceptance of the Offer.

11. OGS Share Option Schemes

    The Offer extends to any shares in OGS which are unconditionally allotted or
    issued pursuant to the exercise of existing options under the OGS Share
    Option Schemes while the Offer remains open for acceptance (or such earlier
    date as Celltech may, subject to the City Code, decide).

    Appropriate proposals will be made to holders of options under the OGS Share
    Option Schemes as soon as practicable. Such proposals will be conditional
    upon the Offer becoming or being declared unconditional in all respects.

12. OGS/CAT Scheme

    OGS Securityholders should be aware that it is a condition of the Offer that
    the OGS/CAT Scheme does not become effective. Any OGS Shareholder who wishes
    to accept the Offer should make an election in the forms of proxy provided
    in relation to the OGS/CAT Scheme to vote against the resolutions to approve
    the OGS/CAT Scheme to be proposed at the OGS Court Meeting and the OGS EGM.
    Any OGS ADS Holder who wishes to accept the Offer should make an instruction
    in the voting instruction card provided in relation to the OGS/CAT Scheme to
    vote against the resolutions to be proposed at the OGS Court Meeting and the
    OGS EGM.

13. Overseas Holders of OGS Securities

    The availability of the Offer to persons not resident in the UK or the US
    may be affected by the laws of the relevant jurisdiction. Persons who are
    not resident in the UK or the US should inform themselves about and observe
    any applicable requirements.

    The Offer in the United States is made solely by Celltech, and neither
    JPMorgan nor any of its affiliates is making the Offer in the United States.
    Unless otherwise determined by Celltech and permitted by applicable law and
    regulation, the Offer (including the Loan Note Alternative) is not being
    made, directly or indirectly, in or into, Australia, Canada or Japan and,
    subject to certain exemptions, the Offer is not capable of acceptance from
    or within Australia, Canada or Japan. Accordingly, neither this
    announcement, the Offer Document nor the Acceptance Forms are being or may
    be mailed or otherwise forwarded, distributed or sent into or from
    Australia, Canada or Japan and doing so may render any purported acceptance
    of the Offer invalid. All OGS Securityholders (including nominees, trustees
    or custodians) who may have a contractual or legal obligation, or may
    otherwise intend, to forward any or all of this announcement, the Offer
    Document and the Acceptance Forms, should read the further details in this
    regard which will be contained in the Offer Document before taking any
    action.

    The Loan Notes to be issued pursuant to the Loan Note Alternative have not
    been, and will not be, listed on any stock exchange and have not been and
    will not be registered under the US Securities Act or under any relevant
    securities laws of any state or other jurisdiction of the United States, or
    under the relevant securities laws of Australia, Canada or Japan or any
    other jurisdiction. Accordingly, unless an exemption under such relevant
    laws is available, Loan Notes may not be offered, sold, re-sold or
    delivered, directly or indirectly, in, into or from the United States,
    Australia, Canada or Japan or any other jurisdiction in which an offer of
    Loan Notes would constitute a violation of relevant laws or require
    registration thereof, or to or for the account or benefit of any US Person
    or resident in Australia, Canada or Japan or any other such jurisdiction.

    Notwithstanding the foregoing, Celltech retains the right to permit the
    Offer to be accepted and any sale of OGS Securities pursuant to the Offer to
    be completed if, in its sole discretion, it is satisfied that the
    transaction in question can be undertaken in compliance with applicable law
    and regulation.

14. Rights of Withdrawal

    Except to the extent of the exemptive relief which may be granted by the
    SEC, the Offer is subject to the US tender offer rules applicable to
    securities registered under the Exchange Act, as well as to the City Code.
    This has necessitated a number of changes from the procedures which normally
    apply to offers for companies governed by the City Code, including those
    applicable to the rights of OGS Securityholders to withdraw their acceptance
    of the Offer.

    Under the Offer, OGS Securityholders will be able to withdraw their
    acceptances at any time during the Initial Offer Period but will not have
    any withdrawal rights during the Subsequent Offer Period, except in certain
    limited circumstances. The Subsequent Offer Period must remain open for at
    least 14 days but may be extended.

    The Offer will be deemed not to have been validly accepted in respect of any
    OGS Shares (including those represented by OGS ADSs), acceptances in respect
    of which have been validly withdrawn. However, the Offer may be accepted
    again in respect of any withdrawn OGS Securities by following one of the
    procedures which will be described in the Offer Document at any time prior
    to expiry or lapse of the Offer.

    It should be noted that by virtue of the conflicting provisions of the City
    Code and US federal securities laws, the Panel has agreed that the
    Acceptance Condition can be structured so that the Offer cannot become or be
    declared unconditional as to acceptances until such time as all other
    Conditions to the Offer have been satisfied, fulfilled or, to the extent
    permitted, waived. The Acceptance Condition in paragraph (a) of Part A of
    Appendix I to this announcement reflects this. Further details of these
    rights of withdrawal and the procedure for effecting withdrawals will be set
    out in the Offer Document.

15. Compulsory acquisition and application for de-listing

    If Celltech receives acceptances under the Offer in respect of, and/or
    otherwise acquires, 90 per cent or more of the OGS Shares (including those
    represented by OGS ADSs) to which the Offer relates, Celltech intends to
    exercise its rights pursuant to the provisions of sections 428 to 430F of
    the Companies Act to acquire compulsorily the remaining OGS Shares
    (including those represented by OGS ADSs).

    Furthermore, as soon as it is appropriate and possible to do so and subject
    to the Offer becoming or being declared unconditional in all respects,
    Celltech intends to procure the making of an application by OGS to the
    London Stock Exchange and the UK Listing Authority respectively for the
    cancellation of the trading in OGS Shares on the London Stock Exchange's
    market for listed securities and the listing of the OGS Shares on the
    Official List and intends to seek to re-register OGS as a private company
    under the relevant provisions of the Companies Act. It is anticipated that
    such cancellation will take effect not earlier than 20 UK Business Days
    after the offer becomes or is declared unconditional in all respects.
    De-listing would significantly reduce the liquidity and marketability of any
    OGS Shares not assented to the Offer.

    Celltech also intends that OGS applies for the de-listing of OGS ADSs from
    NASDAQ which would significantly reduce the liquidity and marketability of
    any OGS ADSs. Celltech may also request that OGS terminates the existing
    deposit agreement through which the OGS ADS programme is operated.

16. General

    To the best of Celltech's knowledge and belief, and save as disclosed in
    this announcement, neither Celltech nor any director of Celltech, nor any
    person acting in concert with Celltech, owns or controls any OGS Securities
    or any securities convertible or exchangeable into, or any rights to
    subscribe for or purchase, or any options to purchase any OGS Securities or
    holds any derivatives referenced to OGS Securities.

    The Offer will be made by Celltech and (outside the United States) by
    JPMorgan on its behalf.

    This announcement does not constitute an offer or invitation to purchase any
    securities or a solicitation of an offer to buy any securities, pursuant to
    the Offer or otherwise.

    The conditions and certain further terms of the Offer are set out in
    Appendix I.

    Details of the sources of information and bases of calculation used in this
    announcement are set out in Appendix II.

    Definitions used in this announcement are set out in Appendix III.

17. Offer documentation


    The formal Offer Document will be sent to OGS Securityholders shortly and,
    for information only, to participants in the OGS Share Option Schemes. The
    Offer will be on terms and will be subject to the conditions which are set
    out in Appendix I and to those terms which will be set out in the Offer
    Document and in the accompanying Acceptance Forms, and such further terms as
    may be required to comply with the rules and regulations of the Financial
    Services Authority, the UK Listing Authority and the London Stock Exchange
    and with the City Code and US federal securities laws (except to the extent
    of any exemptive relief granted by the SEC).


This announcement does not constitute an offer or invitation to purchase any
securities or a solicitation of an offer to buy any securities, pursuant to the
Offer or otherwise. The Offer will be made solely by the Offer Document and the
Acceptance Forms accompanying the Offer Document, which will contain the full
terms and conditions of the Offer, including details of how the Offer may be
accepted. Celltech will be filing a Tender Offer Statement containing the Offer
Document and other related information on the date the Offer Document is mailed
to OGS Securityholders. Free copies of those documents will be available on the
SEC's website at 
www.sec.gov.
 The Offer Document and the Acceptance Forms
accompanying the Offer Document will be made available to all OGS
Securityholders at no charge to them. OGS Securityholders are advised to read
the Offer Document and the accompanying Acceptance Forms when they are sent to
them because they will contain important information. OGS Securityholders in the
US are also advised to read the Tender Offer Statement because it will contain
important information.

Unless otherwise determined by Celltech and permitted by applicable law and
regulation, the Offer (including the Loan Note Alternative) will not be made,
directly or indirectly, in or into, or by use of the mails of, or by any other
means or instrumentality (including, without limitation, telephonically or
electronically) of interstate or foreign commerce of, or of any facility of a
national securities exchange of Canada, nor will it be made in or into Australia
or Japan and the Offer will not be capable of acceptance by any such use, means,
instrumentality or facilities or from within Australia, Canada or Japan.
Accordingly, unless otherwise determined by Celltech and permitted by applicable
law and regulation, neither copies of this announcement nor any other documents
relating to the Offer are being, or may be, mailed or otherwise forwarded,
distributed or sent in or into Australia, Canada or Japan and persons receiving
such documents (including custodians, nominees and trustees) must not distribute
or send them in, into or from such jurisdictions.

The Loan Notes to be issued pursuant to the Loan Note Alternative have not been,
and will not be, listed on any stock exchange and have not been and will not be
registered under the US Securities Act or under any relevant securities laws of
any state or other jurisdiction of the United States, or under the relevant
securities laws of Australia, Canada or Japan or any other jurisdiction.
Accordingly, unless an exemption under such relevant laws is available, Loan
Notes may not be offered, sold, re-sold or delivered, directly or indirectly,
in, into or from the United States, Australia, Canada or Japan or any other
jurisdiction in which an offer of Loan Notes would constitute a violation of
relevant laws or require registration of the Loan Notes, or to or for the
account or benefit of any US Person or resident of Australia, Canada or Japan or
any other such jurisdiction.

JPMorgan is acting for Celltech and for no one else in connection with the Offer
and will not be responsible to anyone other than Celltech for providing the
protections afforded to customers of JPMorgan or for providing advice in
relation to the Offer.

The Panel wishes to draw the attention of member firms of NASDAQ to certain UK
dealing disclosure requirements during the offer period. The offer period (in
accordance with the City Code, which is published and administered by the Panel)
commences at the time when an announcement is made of a proposed or possible
offer, with or without terms. OGS has equity securities traded on the London
Stock Exchange and NASDAQ.

The above disclosure requirements are set out in more detail in Rule 8 of the
City Code. In particular, Rule 8 requires public disclosure of dealings during
the offer period by persons who own or control, or who would as a result of any
transaction own or control, one per cent. or more of any class of relevant
securities of the offeree company. Relevant securities include OGS Shares, OGS
ADSs and instruments convertible into OGS Shares or OGS ADSs. This requirement
will apply until the first closing date or, if this is later, the date when the
Offer becomes or is declared unconditional or lapses.

Disclosure should be made on an appropriate form by no later than 12 noon London
time (7 a.m. New York City time) on the business day following the date of the
dealing transaction. These disclosures should be published through a Regulatory
Information Service.

The Panel requests that member firms advise those of their clients who wish to
deal in the relevant securities of OGS, whether in the United States or in the
UK, that they may be affected by these requirements. If there is any doubt as to
their application the Panel should be consulted (telephone number: +44 (0) 20
7382 9026, fax number: +44 (0) 20 7638 1554).

This announcement contains certain 'forward-looking' statements which are
naturally subject to uncertainty and changes in circumstances. Actual results
may vary materially from the expectations contained in this announcement. The
forward-looking statements contained in this announcement include statements
about the feasibility and benefits of the acquisition of OGS by Celltech.
Factors that would cause actual results to differ materially from those
described in this announcement include: the inability to obtain necessary
regulatory approvals or to obtain them on acceptable terms; the inability
successfully to integrate OGS within the Celltech Group or to realise synergies
from such integration; costs related to the acquisition of OGS; the economic
environment of the industries in which Celltech and OGS operate; the general
economic environment; and other risk factors detailed in OGS' and Celltech's
filings with the SEC.

This announcement has been approved by JPMorgan for the purpose of section 21 of
the Financial Services and Markets Act 2000 only.





                                   APPENDIX I

               CONDITIONS AND CERTAIN FURTHER TERMS OF THE OFFER

The Offer, which will be made by Celltech and (outside the United States) by
JPMorgan on its behalf, complies with the applicable rules and regulations of
the City Code and with the Exchange Act. In addition, the Offer will be governed
by English law and will be subject to the jurisdiction of the courts of England
and will be made on the terms and conditions set out below and in the Acceptance
Forms.

Part A:     Conditions of the Offer

The Offer will be subject to the following conditions:


        (a)     valid acceptances being received (and not, where permitted,
        withdrawn) by 3.00 p.m. (London time), 10.00 a.m. (New York City time)
        on the day following the twentieth US Business Day following the date of
        the Offer or such later time(s) and/or date(s) as Celltech may, subject
        to the City Code, decide in respect of not less than 90 per cent. in
        nominal value (or such lesser percentage as Celltech may decide) of the
        OGS Shares (including OGS Shares represented by OGS ADSs) to which the
        Offer relates, provided that this condition will not be satisfied unless
        Celltech and its wholly-owned subsidiaries shall have acquired, or
        agreed to acquire, pursuant to the Offer or otherwise, OGS Shares
        (including OGS Shares represented by OGS ADSs) carrying more than 50 per
        cent. of the voting rights normally exercisable at a general meeting of
        OGS, including for this purpose (to the extent, if any, required by the
        Panel) any such voting rights attaching to any OGS Shares (including OGS
        Shares represented by OGS ADSs) that are unconditionally allotted or
        issued before the Offer becomes or is declared unconditional as to
        acceptances whether pursuant to the exercise of any outstanding
        subscription or conversion rights or otherwise and for the purposes of
        this condition:

            (i)     OGS Shares (including OGS Shares represented by OGS ADSs)
            which have been unconditionally allotted but not issued shall be
            deemed to carry the voting rights they will carry on issue; and

            (ii)     the expression 'OGS Shares (including OGS Shares
            represented by OGS ADSs) to which the Offer relates' shall be
            construed in accordance with sections 428 to 430F of the Companies
            Act 1985,

        provided further that, unless Celltech otherwise determines, this
        condition (a) shall be capable of being satisfied only at a time when
        all of the other conditions (b) to (j) inclusive have been either
        satisfied, fulfilled or, to the extent permitted, waived;

        (b)     the Office of Fair Trading indicating, in terms reasonably
        satisfactory to Celltech, that it is not the intention of the Secretary
        of State for Trade and Industry to refer the proposed acquisition of OGS
        by Celltech, or any matter arising therefrom, to the Competition
        Commission;

        (c)     insofar as the Offer, or any matter arising therefrom,
        constitutes a concentration that must be notified in accordance with
        Section 39 of the German Act against Restraints of Competition ('ARC',
        Gesetz gegen Wettbewerbsbeschrankungen), (i) notification from the
        German Federal Cartel Office ('FCO') that the conditions for a
        prohibition of the proposed acquisition of shares in, or control of, OGS
        by Celltech set out in Section 36 para.1 of the ARC are not fulfilled;
        or (ii) the expiry of the one month time limit laid down in Section 40
        para.1 of the ARC without Celltech having been notified by the FCO that
        it has entered into an examination of the proposed acquisition of shares
        in, or control of, OGS by Celltech; or (iii) approval or deemed approval
        of the proposed acquisition of shares in, or control of, OGS by Celltech
        by the FCO pursuant to Section 40 para.2 of the ARC;

        (d)     the OGS/CAT Scheme (or any other scheme of arrangement under
        section 425 of the Companies Act between OGS and the OGS Shareholders
        which may be proposed to effect a merger between CAT and OGS) shall not
        have become effective in accordance with its terms;

        (e)     no government or governmental, quasi-governmental,
        supranational, statutory or regulatory body or association, institution
        or agency (including any trade agency) or any court or other body
        (including any professional or environmental body) or person in any
        jurisdiction (each a 'Relevant Authority') having decided to take,
        instituted or threatened any action, proceeding, suit, investigation,
        enquiry or reference or enacted, made or proposed and there not
        continuing to be outstanding any statute, regulation, order or decision
        that would or might be reasonably expected to:

            (i)     make the Offer or the acquisition or the proposed
            acquisition of any shares in, or control of, OGS by Celltech void,
            unenforceable or illegal or directly or indirectly prohibit or
            otherwise materially restrict, delay or interfere with the
            implementation of, or impose material additional conditions or
            obligations with respect to, or otherwise challenge, the Offer or
            the acquisition of any shares in, or control of, OGS by Celltech;

            (ii)     require, prevent or delay the divestiture (or alter the
            terms of any proposed divestiture) by the Wider Celltech Group or
            the Wider OGS Group of all or any substantial part of their
            respective businesses, assets or properties or impose any limitation
            on their ability to conduct all or any part of their respective
            businesses and to own any of their respective assets or properties;

            (iii)     impose any material limitation on, or result in any
            material delay in, the ability of any member of the Wider Celltech
            Group to acquire or hold or to exercise effectively, directly or
            indirectly, all or any rights of ownership of shares or other
            securities (or the equivalent) in, or to exercise management control
            over, any member of the Wider OGS Group or on the ability of any
            member of the Wider OGS Group to hold or exercise effectively,
            directly or indirectly, all or any rights of ownership of shares or
            other securities (or the equivalent) in, or to exercise management
            control over, any other member of the Wider OGS Group in each case
            to an extent which is material in the context of the Wider Celltech
            Group taken as a whole or, as the case may be, the Wider OGS Group
            taken as a whole;

            (iv)     require any member of the Wider Celltech Group or of the
            Wider OGS Group to acquire or offer to acquire any shares or other
            securities (or the equivalent) in any member of the Wider OGS Group
            or any member of the Wider Celltech Group where such acquisition
            would be material in the context of the Wider Celltech Group taken
            as a whole in the context of the Offer or, as the case may be, the
            Wider OGS Group taken as a whole;

            (v)     impose any material limitation on the ability of any member
            of the Wider Celltech Group or the Wider OGS Group to integrate or
            co-ordinate its business, or any part of it, with the businesses or
            any part of the businesses of any other member of the Wider Celltech
            Group and/or the Wider OGS Group; or

            (vi)     otherwise materially and adversely affect the business,
            assets, financial or trading position or profits of any member of
            the Wider Celltech Group or of the Wider OGS Group,

        and all applicable waiting and other time periods during which any such
        Relevant Authority could decide to take, institute or threaten any such
        action, proceeding, suit, investigation, enquiry or reference having
        expired, lapsed or been terminated;

        (f)     all necessary filings having been made and all appropriate
        waiting periods (including any extensions thereof) under any applicable
        legislation or regulation of any jurisdiction having expired, lapsed or
        been terminated in each case in respect of the Offer and the acquisition
        of any shares in, or control of, OGS by Celltech and all authorisations,
        orders, grants, recognitions, confirmations, licences, consents,
        clearances, permissions and approvals ('authorisations') necessary or
        appropriate in any jurisdiction for or in respect of the Offer and the
        proposed acquisition of any shares in, or control of, OGS by Celltech
        being obtained in terms and in a form reasonably satisfactory to
        Celltech from appropriate Relevant Authorities or from any persons or
        bodies with whom any member of the Wider Celltech Group or the Wider OGS
        Group has entered into contractual arrangements and such authorisations
        together with all authorisations necessary or appropriate for any member
        of the Wider OGS Group to carry on its business remaining in full force
        and effect and no intimation of any intention to revoke, suspend,
        restrict or modify or not to renew any of the same having been made and
        all necessary statutory or regulatory obligations in any jurisdiction
        having been complied with;

        (g)     save as fully and fairly disclosed to Celltech in writing before
        the date of this announcement, there being no provision of any
        agreement, arrangement, licence or other instrument to which any member
        of the Wider OGS Group is a party or by or to which any such member or
        any of its assets is or may be bound, entitled or subject which, as a
        result of the making or implementation of the Offer or the acquisition
        or proposed acquisition by Celltech of any shares in, or change in the
        control or management of, OGS or otherwise, would or might (to an extent
        which is materially adverse in the context of the Wider OGS Group taken
        as a whole) reasonably be expected to result in:

            (i) any monies borrowed by or any other indebtedness (actual or
            contingent) of any such member of the Wider OGS Group becoming
            repayable or capable of being declared repayable immediately or
            earlier than the stated repayment date or the ability of such member
            to borrow monies or incur any indebtedness being withdrawn or
            inhibited;

            (ii)     the creation or enforcement of any mortgage, charge or
            other security interest over the whole or any part of the business,
            property or assets of any such member of the Wider OGS Group or any
            such security interest (whenever arising or having arisen) becoming
            enforceable;

            (iii)any assets or interest of any such member of the Wider OGS
            Group being or falling to be disposed of or charged or any right
            arising under which any such asset or interest could be required to
            be disposed of or charged, other than in the ordinary course of
            business;

            (iv)the interest or business of any such member of the Wider OGS
            Group in or with any other person, firm or company (or any
            agreements or arrangements relating to such interest or business)
            being terminated or adversely affected;

            (v)     any such member of the Wider OGS Group ceasing to be able to
            carry on business under any name under which it presently does so;

            (vi)the value of any such member of the Wider OGS Group or its
            financial or trading position being prejudiced or adversely
            affected;

            (vii)any such agreement, arrangement, licence or other instrument
            being terminated or adversely modified or any onerous obligation
            arising or any adverse action being taken or arising thereunder; or

            (viii)the creation of any liabilities (actual or contingent) by any
            such member of the Wider OGS Group;

        and no event having occurred which, under any provision of any
        agreement, arrangement, licence or other instrument to which any member
        of the Wider OGS Group is a party or by or to which any such member or
        any of its assets may be bound or be subject, could result in any events
        or circumstances as are referred to in sub-paragraphs (i) to (viii) of
        this paragraph (g);

        (h)     except as disclosed in the annual report and accounts of OGS for
        the year ended 31 December, 2001, or the interim financial statements of
        OGS for the six months ended 30 June, 2002 or as publicly announced to a
        Regulatory Information Service by or on behalf of OGS or as otherwise
        fairly disclosed to Celltech in writing before the date of this
        announcement, no member of the Wider OGS Group having since 31 December,
        2001:

            (i) issued or agreed to issue or authorised the issue of additional
            shares of any class, or securities convertible into, or rights,
            warrants or options to subscribe for or acquire, any such shares or
            convertible securities save as between OGS and wholly-owned
            subsidiaries of OGS prior to the date of this announcement, or upon
            the exercise of rights to subscribe for OGS Shares pursuant to
            options granted under the OGS Share Option Schemes prior to the date
            of this announcement;

            (ii) recommended, declared, paid or made any bonus, dividend or
            other distribution, whether payable in cash or otherwise, other than
            a distribution by any wholly-owned subsidiary of OGS;

            (iii)     implemented or authorised any merger or demerger or (other
            than in the ordinary course of business) acquired or disposed of or
            transferred, mortgaged or charged, or created any other security
            interest over, any asset or any right, title or interest in any
            asset;

            (iv) implemented or authorised any reconstruction, amalgamation,
            scheme or other transaction or arrangement (other than in the
            ordinary course of business);

            (v)     purchased, redeemed or repaid any of its own shares or other
            securities or reduced or made or authorised any other change in its
            share capital;

            (vi)     made or authorised any change in its loan capital or issued
            or authorised the issue of any debentures or (other than in the
            ordinary course of business and save as between OGS and wholly-owned
            subsidiaries of OGS) incurred or increased any indebtedness or
            contingent liability;

            (vii)     entered into, varied or terminated, or authorised the
            entry into, variation or termination of, any contract, commitment or
            arrangement (whether in respect of capital expenditure or otherwise)
            which is outside the ordinary course of business or which is of a
            long term, onerous or unusual nature or magnitude or which involves
            or could involve an obligation of a nature or magnitude which is
            material;

            (viii)entered into any contract, commitment or arrangement which
            would be restrictive on the business of any member of the Wider OGS
            Group or the Wider Celltech Group (other than to a nature and extent
            which is not material in the context of the business concerned);

            (ix)     been unable, or admitted in writing that it is unable, to
            pay its debts or having stopped or suspended (or threatened to stop
            or suspend) payment of its debts generally or ceased or threatened
            to cease carrying on all or a substantial part of its business;

            (x)     taken any corporate action or had any legal proceedings
            started or threatened against it for its winding-up (voluntary or
            otherwise), dissolution or reorganisation (or for any analogous
            proceedings or steps in any jurisdiction) or for the appointment of
            a receiver, administrator, administrative receiver, trustee or
            similar officer (or for the appointment of any analogous person in
            any jurisdiction) of all or any of its assets and revenues;

            (xi)     waived, compromised or settled any claim which is material
            in the context of the Wider OGS Group taken as a whole;

            (xii)     entered into or varied the terms of any service agreement
            or arrangement with any director of OGS;

            (xiii)made or consented to any significant change to the terms of
            the trust deeds constituting the pension schemes established for its
            directors and/or employees and/or their dependants or to the
            benefits which accrue, or to the pensions which are payable
            thereunder, or to the basis on which qualification for or accrual or
            entitlement to such benefits or pensions are calculated or
            determined, or to the basis upon which the liabilities (including
            pensions) of such pension schemes are funded or made, or agreed or
            consented to, any change to the trustees, in each case which is
            material; or

            (xiv)entered into any contract, commitment or arrangement or passed
            any resolution or made any offer (which remains open for acceptance)
            with respect to, or proposed or announced any intention to effect or
            propose, any of the transactions, matters or events referred to in
            this condition;

        and for the purpose of this condition 'material' shall mean material in
        the context of the OGS Group taken as a whole;

        (i)     since 31 December, 2001 (except as disclosed in the annual
        report and accounts of OGS for the year then ended or the interim
        financial statements of OGS for the six months ended 30 June, 2002 or as
        publicly announced to a Regulatory Information Service by or on behalf
        of OGS before the date of this announcement);

            (i)     no adverse change having occurred in the business, assets,
            financial or trading position or profits of the Wider OGS Group
            which is material in the context of the OGS Group taken as a whole;

            (ii)     no litigation, arbitration proceedings, prosecution or
            other legal proceedings having been threatened, announced,
            instituted or remaining outstanding by, against or in respect of any
            member of the Wider OGS Group or to which any member of the Wider
            OGS Group is a party (whether as plaintiff or defendant or
            otherwise) and no investigation by any Relevant Authority or other
            investigative body against or in respect of any member of the Wider
            OGS Group having been threatened, announced, instituted or remaining
            outstanding by, against or in respect of any member of the Wider OGS
            Group which would or might materially and adversely affect the Wider
            OGS Group taken as a whole; and

            (iii)     no contingent or other liability having arisen which would
            or might materially and adversely affect the Wider OGS Group taken
            as a whole;

        (j)     Celltech not having discovered that:

            (i)     any financial, business or other information publicly
            disclosed at any time by any member of the Wider OGS Group is
            misleading, contains a misrepresentation of fact or omits to state a
            fact necessary to make the information contained therein not
            misleading which in any case is material to the financial or trading
            position of the Wider OGS Group taken as a whole;

            (ii)     any member of the Wider OGS Group is subject to any
            liability, contingent or otherwise, which is not disclosed in the
            annual report and accounts of OGS for the year ended 31 December,
            2001 or the interim financial statements of OGS for the six months
            ended 30 June, 2002 and which is material in the context of the
            Wider OGS Group taken as a whole;

            (iii)any past or present member of the Wider OGS Group has failed to
            comply with any applicable legislation or regulations of any
            jurisdiction or any notice or requirement of any Relevant Authority
            with regard to the storage, disposal, discharge, spillage, release,
            leak or emission of any waste or hazardous or harmful substance or
            any substance likely to impair the environment or harm human or
            animal health or otherwise relating to environmental matters or that
            there has otherwise been any such storage, disposal, discharge,
            spillage, release, leak or emission (whether or not the same
            constituted non-compliance by any person with any such legislation
            or regulation, and whenever the same may have taken place), any of
            which non-compliance would be likely to give rise to any liability
            (whether actual or contingent) or cost on the part of any member of
            the Wider OGS Group and which is material in the context of the
            Wider OGS Group taken as a whole; or

            (iv)there is or is likely to be any obligation or liability (whether
            actual or contingent) to make good, repair, re-instate or clean up
            any property now or previously owned, occupied, operated or made use
            of or controlled by any past or present member of the Wider OGS
            Group under any environmental legislation, regulation, notice,
            circular or order of any Relevant Authority in any jurisdiction and
            which is material in the context of the Wider OGS Group taken as a
            whole.

Celltech reserves the right to waive all or any of conditions (b) to (j)
inclusive, in whole or in part. The Offer will lapse unless all the above
conditions are fulfilled or (if capable of waiver) waived or, where appropriate,
determined by Celltech to have been or remain satisfied by 3.00 p.m. (London
time), 10.00 a.m. (New York City time) on the day following the twentieth US
Business Day following the date of the Offer (or such later date as Celltech may
determine, in accordance with the City Code and the Exchange Act). Celltech
shall be under no obligation to waive or treat as fulfilled any of conditions
(b) to (j) inclusive by a date earlier than the latest date for the fulfilment
thereof notwithstanding that the other conditions of the Offer may at such
earlier date have been waived or fulfilled and that there are at such earlier
date no circumstances indicating that any of such conditions may not be capable
of fulfilment.

If Celltech is required by the Panel to make an offer or offers for any OGS
Shares under Rule 9 of the City Code, Celltech may make such alterations to the
above conditions as are necessary to comply with that Rule.

The Offer will lapse (unless the Panel otherwise consents) if, before 3.00 p.m.
(London time), 10.00 a.m. (New York City time) on the day following the
twentieth US Business Day following the date of the Offer or the date when the
Offer becomes unconditional as to acceptances (whichever is the later), the
acquisition of OGS is referred to the Competition Commission.

Part B:     Certain further terms of the Offer

The OGS Shares (including OGS Shares represented by OGS ADSs) will be acquired
by Celltech fully paid and free from all liens, equities, charges, encumbrances,
rights of pre-emption and other third party rights or interests of any nature
whatsoever and together with all rights, now or hereafter, attaching thereto,
including the right to receive and retain in full all dividends and other
distributions declared, made or paid on or after the date of this announcement.

The availability of the Offer to persons not resident in the United Kingdom may
be affected by the laws of the relevant jurisdictions in which they are located.
Persons who are not resident in the United Kingdom should inform themselves
about, and observe, any applicable requirements.

The Offer will not be made, directly or indirectly, in or into Australia, Canada
or Japan. Accordingly, copies of this announcement are not being, and must not
be, mailed or otherwise distributed or sent in or into or from Australia, Canada
or Japan and doing so may render invalid any purported acceptance of the Offer.





                                  APPENDIX II

                SOURCES OF INFORMATION AND BASES OF CALCULATION

General

Unless otherwise stated, financial information relating to Celltech has been
extracted from the relevant published audited annual report and accounts of
Celltech and/or the published interim results of Celltech and/or other public
statements made by Celltech. Unless otherwise stated, information relating to
OGS (including financial information) and the OGS/CAT Scheme has been extracted
from the relevant published audited annual report and consolidated financial
statements and/or from the published interim results of OGS, the documents
published by OGS and by CAT in connection with the OGS/CAT Scheme and/or other
public statements made by OGS.

Value of Offer

The level at which the Offer values the issued share capital of OGS is based
upon 55,729,534 OGS Shares in issue on 22 January 2003, the last UK Business Day
prior to the announcement by CAT and OGS of their agreed merger, and excludes
all OGS shares which could be issued upon exercise of any options granted.

Market value of Celltech

The market value of Celltech is based on a Closing Price of 323.75p on 25
February 2003 and 275,552,386 million Celltech shares in issue, and excludes all
Celltech shares which could be issued upon exercise of any options granted.

Cash and liquid resources and loan notes of Celltech

The amount of cash and liquid resources at £105.1 million and loan notes at
£31.2 million as at 31 December 2002 have been taken from internal management
information of Celltech.




                                      APPENDIX III

                                      DEFINITIONS

'Acceptance Condition'      The condition in paragraph (a) of Part A of Appendix I

'Acceptance Forms'          The Form of Acceptance, and in relation to OGS ADS Holders only, the Letter of
                            Transmittal and the Notice of Guaranteed Delivery

'CAT'                       Cambridge Antibody Technology Group plc

'Celltech'                  Celltech Group plc

'Celltech Group'            Celltech and its subsidiary undertakings

'City Code'                 The City Code on Takeovers and Mergers

'Closing Price'             The closing middle-market quotation on the London Stock Exchange

'Companies Act'             The UK Companies Act 1985, as amended

'Conditions'                The conditions of the Offer set out in Appendix I to this announcement, and 'Condition'
                            means any one of them

'Exchange Act'              The US Securities Exchange Act of 1934 (as amended) and the rules and regulations
                            promulgated thereunder

'Form of Acceptance'        The form of acceptance and authority and election relating to the Offer which will
                            accompany the Offer Document for use by OGS Shareholders wishing to accept the Offer

'Initial Offer Period'      The period during which the Offer remains unconditional, which commences on the date of
                            the Offer Document and expires on the earlier of the Offer lapsing or becoming or being
                            declared unconditional in all respects in accordance with its terms

'JPMorgan'                  J.P. Morgan plc

'Letter of Transmittal'     The letter of transmittal relating to the Offer which will accompany the Offer Document
                            for use by OGS ADS Holders wishing to accept the Offer

'LIBOR'                     The average (rounded down where necessary to the nearest whole multiple of one sixteenth
                            of one per cent.) of the respective rates per annum at which any two London clearing
                            banks selected by Celltech are prepared to offer six month sterling deposits of
                            £1,000,000 to leading banks in the London inter bank market for sterling at or about
                            11.00 a.m. (London time) on the first day of the relevant interest period or, if such a
                            day is not a UK Business Day, on the next succeeding UK Business Day

'Loan Note Alternative'     The alternative under which certain OGS Securityholders who validly accept the Offer will
                            be entitled to elect to receive Loan Notes instead of all or part of the cash
                            consideration to which they would otherwise be entitled under the Offer

'Loan Notes'                The loan notes of Celltech to be issued pursuant to the Loan Note Alternative

'London Stock Exchange'     The London Stock Exchange plc

'NASDAQ'                    The NASDAQ Stock Market Inc.

'Notice of Guaranteed       The notice of guaranteed delivery relating to the Offer which will accompany the Offer

Delivery'                   Document for use by OGS ADS Holders

'Offer'                     The offer to be made by Celltech and (outside the US) JPMorgan on its behalf to acquire
                            all of the issued and to be issued OGS Shares (including those represented by OGS ADSs)
                            on the terms and subject to the conditions to be set out in the Offer Document and the
                            Acceptance Forms including, where the context so requires, any subsequent revision,
                            variation, extension or renewal of such offer

'Offer Document'            The document containing the terms and conditions of the Offer, including the Loan Note
                            Alternative, to be sent to OGS Securityholders

'Official List'             The Official List of the UK Listing Authority

'OGS'                       Oxford GlycoSciences Plc

'OGS ADSs'                  American Depositary Shares issued in respect of OGS Shares, each representing one OGS
                            Share

'OGS ADS Holders'           Holders of OGS ADSs

'OGS/CAT Scheme'            The proposed scheme of arrangement under section 425 of the Companies Act between OGS and
                            the OGS Shareholders to give effect to the proposed merger of OGS and CAT, with, or
                            subject to, any modification, addition or condition approved or imposed by the Court

'OGS Court Meeting'         The meeting of OGS Shareholders convened by order of the Court pursuant to section 425 of
                            the Companies Act to consider, and if thought fit, approve the OGS/CAT Scheme, to be held
                            on 11 March 2003, including any adjournment thereof

'OGS EGM'                   The extraordinary general meeting of OGS to consider any resolutions to approve and
                            implement the OGS/CAT Scheme and the proposed merger of OGS and CAT, to be held on 11
                            March 2003, including any adjournment thereof

'OGS Group'                 OGS and its subsidiary undertakings

'OGS Securities'            OGS Shares and OGS ADSs

'OGS Securityholders'       Holders of OGS Securities

'OGS Shareholders'          Holders of OGS Shares

'OGS Shares'                The existing unconditionally allotted or issued and fully paid ordinary shares of 5p each
                            in OGS (including those represented by OGS ADSs) and any further such shares which are
                            unconditionally allotted or issued while the Offer remains open for acceptance (or such
                            earlier date, not being earlier than the date on which the Offer becomes or is declared
                            wholly unconditional, as Celltech may, subject to the City Code, decide)

'OGS Share Option Schemes'  The OGS Limited 1989 Share Option Scheme, the OGS Group Plc 1994 Share Option Scheme, the
                            OGS Executive Share Option Scheme and the OGS Sharesave Scheme

'Panel'                     The Panel on Takeovers and Mergers

'Regulatory Information     Any of the services set out in Schedule 12 to the listing rules of the UK Listing
Service'                    Authority

'R&D'                       Research and development

'SEC'                       The United States Securities and Exchange Commission

'Subsequent Offer Period'   The period commencing immediately after the end of the Initial Offer Period during which
                            the Offer will remain open for acceptance

'Tender Offer Statement'    The Tender Offer Statement on Schedule TO to be filed by Celltech with the SEC pursuant
                            to Section 14(d) (1) of the Exchange Act

'UK Business Day'           A day other than a Saturday or a Sunday on which banks are generally open in London for
                            normal business

'UK Listing Authority'      The Financial Services Authority acting in its capacity as the competent authority for
                            the purposes of Part VI of the Financial Services and Markets Act 2000

'United Kingdom' or 'UK'    The United Kingdom of Great Britain and Northern Ireland

'US' or 'United States'     The United States of America, its territories and possessions, any State of the United
                            States and the District of Columbia and all other areas subject to its jurisdiction

'US Business Day'           Any day, other than a Saturday, Sunday or a federal holiday in the United States, and
                            consisting of the time period from 12.01a.m. to 12.00 midnight Eastern (US) time

'US Person'                 A US person as defined in Regulation S under the US Securities Act

'US Securities Act'         The US Securities Act of 1933, as amended

'Wider Celltech Group'      Celltech and its subsidiary undertakings, associated undertakings and any other
                            undertakings in which Celltech and such undertakings (aggregating their interests) have a
                            substantial interest

'Wider OGS Group'           OGS and its subsidiary undertakings, associated undertakings and any other undertakings
                            in which OGS and such undertakings (aggregating their interests) have a substantial
                            interest

'£', 'p', and 'pence'       Denote the lawful currency of the UK



END


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