Response to OGS Announcement

Celltech Group PLC
14 March 2003



  NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION IN OR INTO AUSTRALIA, CANADA OR
                                     JAPAN



                                                                   14 March 2003

                        CELLTECH GROUP PLC ('CELLTECH')

                CASH OFFER FOR OXFORD GLYCOSCIENCES PLC ('OGS')



The Board of Celltech is pleased to note that the Board of OGS, in an
announcement made earlier today, has withdrawn its recommendation of the CAT
merger offer.

Based on the closing price of a CAT Share on 13 March 2003, being the last
business day prior to this announcement, the implied value of OGS under the all
paper CAT merger offer, is £82.9 million or 148.7 pence per OGS share. In
comparison, the value of Celltech's all cash offer is £101.4 million or 182
pence per OGS Share representing an additional 33.3 pence over the implied value
of an OGS Share under the CAT merger offer.

The Board of Celltech continues to believe that its all cash offer of 182 pence
is generous. The first closing date of the Celltech offer is 31 March 2003.

Commenting, Peter Fellner, Chief Executive of Celltech said: 'We are pleased
that the OGS Board has withdrawn its recommendation of the CAT merger and
encourage all OGS Shareholders to accept Celltech's all cash offer. In addition,
those OGS shareholders who may wish to benefit from continued participation in
the future of the UK biotech sector, or Celltech itself, will have the option of
applying their cash proceeds as they see fit following the completion of our
offer.'



Enquiries:

For further information contact:

Celltech Group plc     Telephone: [phone]

Dr Peter Fellner, Chief Executive

Peter Allen, Chief Financial Officer

Richard Bungay, Director of Corporate Communications

JPMorgan     Telephone: [phone]

Bernard Taylor, Vice Chairman

Julian Oakley, Managing Director

Brunswick London      Telephone: [phone]

Jon Coles

Fiona Fong

Brunswick New York      Telephone: [phone]

Cindy Leggett-Flynn



Terms defined in the Offer Document have the same meaning when used in this
announcement.



Celltech and JPMorgan, acting on its behalf outside the United States, are
offering to purchase all of the issued and to be issued ordinary shares of 5
pence each in OGS (including those represented by OGS ADSs) at a price of 182
pence per OGS Share.



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 is being made solely by the Offer Document and the
Acceptance Forms accompanying the Offer Document, which contain the full terms
and conditions of the Offer, including details of how the Offer may be accepted.
Celltech filed with the SEC a Tender Offer Statement on Schedule TO containing
the Offer Document and other related information on 3 March 2003. Free copies of
those documents are available on the SEC's website at www.sec.gov. The Offer
Document and the Acceptance Forms accompanying the Offer Document have been 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
which have been sent to them because they contain important information. OGS
Securityholders in the United States are also advised to read the Tender Offer
Statement because it contains important information.



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, 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 is it being made in or into
Australia or Japan and the Offer is not 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 have been, 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 available
under the Offer 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.

THE OFFER WILL REMAIN OPEN FOR ACCEPTANCE DURING THE INITIAL OFFER PERIOD. THE
INITIAL OFFER PERIOD FOR ACCEPTANCES AND WITHDRAWALS WILL EXPIRE AT 3:00 P.M.
(LONDON TIME), 10:00 A.M. (NEW YORK CITY TIME), ON 31 MARCH 2003, UNLESS
EXTENDED TO A LATER CLOSING DATE. AT THE CONCLUSION OF THE INITIAL OFFER PERIOD,
IF ALL CONDITIONS OF THE OFFER HAVE BEEN SATISFIED, FULFILLED OR, WHERE
PERMITTED, WAIVED, THE OFFER WILL BE EXTENDED FOR A SUBSEQUENT OFFER PERIOD OF
AT LEAST 14 CALENDAR DAYS. OGS SECURITYHOLDERS WILL HAVE THE RIGHT TO WITHDRAW
THEIR ACCEPTANCES OF THE OFFER FROM THE DATE OF THIS ANNOUNCEMENT UNTIL THE
SPECIFIED TIME ON THE LAST DAY OF THE INITIAL OFFER PERIOD, BUT NOT DURING THE
SUBSEQUENT OFFER PERIOD.

The Offer is conditional upon, among other things, valid acceptances being
received (and not, where permitted, being withdrawn) by 3:00 p.m. (London time),
10:00 a.m. (New York City time) on 31 March 2003, or such later time(s) and/or
date(s) as Celltech may, subject to the City Code and in accordance with the
Exchange Act, decide in respect of not less than 90 percent (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 shall have acquired, or agreed
to acquire, pursuant to the Offer or otherwise, OGS Shares (including OGS Shares
represented by OGS ADSs) carrying in aggregate 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 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 pursuant to the exercise of any outstanding
subscription or conversion rights or otherwise.

Celltech reserves the right (but will not be obliged, other than as may be
required by the City Code or the Exchange Act) at any time or from time to time
to extend the Offer and, in such event, any decision to extend the Offer will be
publicly announced by 8:00 a.m. (London time) in the United Kingdom and 8:00
a.m. (New York City time) in the United States on the day (other than a Saturday
or Sunday) following the day on which the Offer was due to expire and which
banks are generally open in London for normal business. Except with the consent
of the Panel, the Initial Offer Period for acceptances and withdrawals may not
extend beyond 1:00 p.m. (London time), 8:00 a.m. (New York City time), on 30
April 2003.



The Directors of Celltech accept responsibility for the information contained in
this announcement, and, to the best of their knowledge and belief (having taken
all reasonable care to ensure such is the case), the information contained in
this announcement is in accordance with the facts and does not omit anything
likely to affect the import of such information.



J.P. Morgan plc, which is regulated in the United Kingdom by the Financial
Services Authority, 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 contents of the Offer Document or any
transaction or arrangement referred to therein.



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
United Kingdom, that they may be affected by these requirements. If there is any
doubt as to their application the Panel should be consulted (telephone number:
[phone], fax number: [phone]).

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



END


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