Medeva PLC

Proposed Merger with Celltech Chiroscience

Medeva PLC
23 November 1999


      Not for release, publication or distribution in or into Canada, 
                            Australia or Japan.


                             Proposed Merger of

                          Celltech Chiroscience plc                           
  
                                     and

                                  Medeva PLC
 

Celltech Chiroscience and Medeva announce that a Circular to Medeva
Shareholders and Listing Particulars in respect of the Merger with Medeva,
which was announced on 11 November 1999, were posted to Medeva Shareholders on
Monday 22 November.  A Circular (together with the Listing Particulars) in
connection with the Merger was posted to Celltech Chiroscience Shareholders on
the same date.  The date of the Medeva Court Meeting and of the Medeva and
Celltech Chiroscience Extraordinary General Meetings is 15 December 1999.


Enquiries:

Brunswick
Katherine Sharkey                    Tel : 0171 404 5959


Taylor Rafferty Associates Inc.
Jim Prout                            Tel: + 1 212 889 4350


Flemings 
David Fletcher                       Tel : 0171 638 5858


Lazard
Christopher Fisher                   Tel: 0171 588 2721


Flemings, which is regulated in the United Kingdom by The Securities and
Futures Authority Limited, is acting for Celltech Chiroscience in connection
with the Merger and for no one else and will not be responsible to anyone
other than Celltech Chiroscience for providing the protections afforded to
customers of Flemings or for providing advice in relation to the Merger.

Lazard, which is regulated in the United Kingdom by The Securities and Futures
Authority Limited, is acting for Medeva in connection with the Merger and for
no one else and will not be responsible to anyone other than Medeva for
providing the protections afforded to customers of Lazard or for providing
advice in relation to the Merger.

This announcement does not constitute an offer or an invitation to purchase
any securities and this announcement does not evidence or record a legally
binding agreement between Celltech Chiroscience and Medeva. Definitions of
terms used in this announcement can be found in the Listing Particulars.

The New Celltech Chiroscience Shares may not be offered or sold in the United
States absent registration under the US Securities Act or an exemption from
registration.  Celltech Chiroscience intends to issue the New Celltech
Chiroscience Shares under the Scheme to holders of Medeva Shares in reliance
upon an exemption from the registration requirements of the US Securities Act
and, as a consequence, the New Celltech Chiroscience Shares to be issued
pursuant to the Scheme will not be registered thereunder.  Medeva Shareholders
who are or will be affiliates of Medeva or Celltech Chiroscience prior to, or
of Celltech Chiroscience after, the Effective Date will be subject to certain
US transfer restrictions relating to New Celltech Chiroscience Shares received
in the Scheme.  Neither the New Celltech Chiroscience Shares nor any other
securities proposed to be issued in connection with the Merger have been
approved or disapproved by the SEC or any US state securities commission.  Any
representation to the contrary is a criminal offence in the United States.