Director/PDMR Shareholding-Amendment

NOTIFICATION OF TRANSACTIONS OF DIRECTORS' DEALINGS

Amendment of transaction announced on 16 December 2011

Due to an error, Oxford Instruments plc (the "Company") exercised and allotted
9,351 shares to Jonathan Flint, Chief Executive, in excess of his entitlement.
Action has been taken to reverse this transaction.

The statement of options exercised, shares sold and retained for Jonathan Flint
on 16 December 2011 is therefore restated as follows:-

                    ESOS and SELTIS Options exercised and shares sold          
                                                                               
                    No. of       Base option No. of       Shares sold Shares   
                    options      price       shares                   retained 
                    exercised                acquired                          
                                                                               
Jonathan Flint      74,788       219p        56,278*      328,447**   108,047  
                                                                               
Chief Executive     100,000      232p        76,613*                           
                                                                               
                    208,666      135p        180,269*                          
                                                                               
                    11,334       135p        11,334                            
                                                                               
                    110,000      nil         110,000                           

*shares acquired equal to "net gain" calculated using the mid market closing
price on 15 December 2011 (992p).

**shares were sold at an average price of 950p on 16 December 2011

Following these transactions, Jonathan Flint will now hold the following number
of ordinary shares of 5p in the Company:-

                            Jonathan Flint 
                                           
                            Chief Executive
                                           
Interest in shares before       50,875     
notification                               
                                           
Total interest in shares        158,922    
following this notification                
                                           
% of issued share capital        0.29%     

This notice is given in fulfilment of the obligations under DTR 3.1.4R(1)

23 December 2011

Susan Johnson-Brett

Company Secretary

Oxford Instruments plc

Tel: [phone]

Email: [e-mail]