Holding(s) in Company

12 June 2006

This notification is prompted by disposal of shares on 7 June 2006, by Aviva
plc and its subsidiaries. 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. Aviva plc and its subsidiaries.
   
 1.1. Morley Fund Management are interested in 1,806,408 shares, which is equal
      to 3.71% of the issued share capital of Oxford Instruments.
   
 1.2. 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           383,705                       
                                                                       
Chase GA Group Nominees Ltd              931,354                       
                                                                       
Chase Nominees Ltd                       105,024                       
                                                                       
CUIM Nominee Ltd                         352,937                       
                                                                       
Vidacos Nominees Ltd                     33,388                        
                                                                       
                                   TOTAL 1,806,408