Director/PDMR Shareholding

NOTIFICATION OF TRANSACTIONS OF DIRECTORS' DEALINGS

Oxford Instruments plc (the "Company") announces that the following directors'
dealings took place:

On 25 January 2011, the following directors acquired ordinary shares of 5p each
in the Company upon the exercise of options granted under the Oxford
Instruments 2001 Executive Share Option Scheme "ESOS". In accordance with the
terms of the ESOS, the options were "net gain" settled as share appreciation
rights by reference to the mid market closing price of the Company's shares on
24 January 2011 (667.5p) and the relevant option price. A number of shares were
sold in the market between 26 January and 1 February 2011 at an average price
of 654.65p, with the balance being retained by the directors, as follows:-

                     ESOS Options exercised and shares sold                    
                                                                               
                     No. of       Base option No. of       Shares     Shares   
                     options      price       shares       sold       retained 
                     exercised                acquired                         
                                              (equal to                        
                                              the "net                         
                                              gain")                           
                                                                               
Jonathan Flint       16,500       219p        11,086       41,283     4,072    
                                                                               
Chief Executive      50,000       210p        34,269                           
                                                                               
Kevin Boyd           25,972       203.75p     18,044       33,576     10,565   
                                                                               
Finance Director     40,000       232p        26,097                           
                                                                               
Charles Holroyd      25,000       187.5p      17,977       73,208     1,000    
                                                                               
Executive Director   25,000       218p        16,835                           
                                                                               
                     19,600       219p        13,169                           
                                                                               
                     12,500       210p        8,567                            
                                                                               
                     27,069       232p        17,660                           

Following this transaction, Jonathan Flint, Kevin Boyd and Charles Holroyd now
hold the following number of ordinary shares of 5p in the Company:-

                           Jonathan Flint   Kevin Boyd       Charles Holroyd   
                                                                               
                           Chief Executive  Finance Director Executive Director
                                                                               
Interest in shares before       46,591           17,807            58,542      
notification                                                                   
                                                                               
Total interest in shares        50,663           28,372            59,542      
following this                                                                 
notification                                                                   
                                                                               
% of issued share capital       0.10%            0.06%             0.12%       

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

2 February 2011

Susan Johnson-Brett

Company Secretary

Oxford Instruments plc

Tel: [phone]

Email: [e-mail]