Celltech Group PLC

Offer Update

Celltech Group PLC
01 April 2003



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



                                                                    1 April 2003

                        CELLTECH GROUP PLC ('CELLTECH')

                CASH OFFER FOR OXFORD GLYCOSCIENCES PLC ('OGS')



On 26 February 2003, the Board of Celltech announced the terms of a cash offer
for the entire issued, and to be issued, share capital of OGS. The Offer is
being made by Celltech and (outside the United States) by 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.

Celltech announces that by 3.00 p.m. (London time) and 10.00 a.m. (New York
time) on 31 March 2003, being the first closing date of the Offer, acceptances
of the Offer had been received in respect of 2,161,947 OGS Shares (including
those represented by OGS ADSs), representing approximately 3.86 per cent. of the
issued share capital of OGS. In addition, as previously announced, on 24 March
2003 Celltech purchased 5,892,971 OGS Shares representing approximately 10.52
per cent. of the issued share capital of OGS, at a price of 182 pence per share.
Celltech did not hold any OGS Shares prior to the commencement of the offer
period.

Accordingly an aggregate of 8,054,918 OGS Shares, representing approximately
14.38 per cent. of the issued share capital of OGS, have been acquired by
Celltech or have been validly assented to the Offer. The Board of Celltech has
therefore decided to extend the Offer until 3.00 p.m. (London time), 10.00 a.m.
(New York time) on Tuesday, 15 April 2003.

Save as set out above, neither Celltech, nor any person acting, or deemed to be
acting, in concert with Celltech, owned any OGS Shares (including OGS Shares
represented by OGS ADSs) or rights over OGS Shares on 22 January 2003 (being the
business day prior to the commencement of the offer period), nor have any of
them acquired or agreed to acquire any OGS Shares (including OGS Shares
represented by OGS ADSs) during the offer period and no acceptances of the Offer
have been received from any persons deemed to be acting in concert with
Celltech.

Shareholders in OGS who wish to accept the Offer, and who have not done so,
should return their Form(s) of Acceptance as soon as possible. Further Forms of
Acceptance can be obtained from Lloyds TSB Registrars, The Causeway, Worthing,
West Sussex BN99 6DA or by telephoning the Helpline on 0870 600 0673 (if calling
from the United Kingdom), (1) 800 858 1202 (if calling from the United States or
if you are an OGS ADS Holder) or +44 (0) 1903 702 767 (if calling from
elsewhere). If you are an OGS ADS Holder and wish to accept the Offer, you
should follow the instructions set out in the Letter of Transmittal. If OGS
Shareholders or OGS ADS Holders are in any doubt as to the procedures for
acceptance, they should contact the Helpline on the above numbers.

The Board of Celltech continues to believe that its all cash offer of 182 pence
is increasingly generous and encourages OGS Securityholders to accept its offer.

Enquiries:

For further information contact:

Celltech Group plc                                Telephone: +44 (0)1753 534 655

Dr Peter Fellner, Chief Executive

Peter Allen, Chief Financial Officer

Richard Bungay, Director of Corporate Communications

JPMorgan                                          Telephone: +44 (0)20 7742 4000

Bernard Taylor, Vice Chairman

Julian Oakley, Managing Director

Brunswick London                                  Telephone: +44 (0)20 7404 5959

Jon Coles

Fiona Fong

Brunswick New York                                 Telephone: +1 212 333 3810

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 of 1933, as
amended 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, AS EXTENDED, WILL EXPIRE
AT 3:00 P.M. (LONDON TIME), 10:00 A.M. (NEW YORK CITY TIME), ON 15 APRIL 2003,
UNLESS FURTHER 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 15 April 2003, or such later time(s) and/or
date(s) as Celltech may, subject to the City Code and in accordance with the US
Securities Exchange Act of 1934, as amended (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 further 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:
+44 (0) 20 7382 9026, fax number: +44 (0) 20 7638 1554).

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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