Holding(s) in Company

12 April 2005

This notification is prompted by purchases made on 8 April 2005, by Morley Fund
Management Limited, totalling 1,211,283. It relates to issued ordinary shares
of £0.05p each in the capital of Oxford Instruments plc in fulfilment of the
obligations imposed by sections 198 to 202 of the Companies Act 1985.

 1. Notification on behalf of Morley Fund Management Limited (a subsidiary of
    Aviva plc)
   
 1. Morley Fund Management are interested in 1,767,257 shares which is equal to
    3.67% of the issued share capital of Oxford Instruments
   
 2. The identity of the registered holders of the shares to which this
    notification relates are set out in the table below:
   
           Registered Holders              Number of Shares Held   
                                                                   
BNY Norwich Union Nominees Ltd                              150,238
                                                                   
Chase GA Group Nominees Ltd                               1,109,288
                                                                   
CUIM Nominee Ltd                                            507,731