Director/PDMR Shareholding

NOTIFICATION OF TRANSACTIONS OF DIRECTORS' DEALINGS

Oxford Instruments plc (the "Company") announces that on 25 September 2009 the
following directors' dealings took place:

The following directors each acquired ordinary shares of 5p each in the Company
following the exercise of nil cost options granted under the Oxford Instruments
Senior Executive Long Term Incentive Scheme. Of these shares, they each sold
sufficient to meet the tax liability and broker's costs at a sale price of
188.08p per share.

                           Jonathan Flint   Kevin Boyd       Charles Holroyd   
                                                                               
                           Chief Executive  Finance Director Executive Director
                                                                               
Shares acquired following       49,500           6,250             16,050      
exercise of options                                                            
                                                                               
Shares sold to meet tax         20,367           2,576             6,605       
liability & broker's cost                                                      
                                                                               
Shares retained                 29,133           3,674             9,445       
                                                                               
% of issued share capital       0.06%            0.007%            0.02%       
                                                                               
Total interest in shares        30,372           10,162            46,810      
following this                                                                 
notification                                                                   
                                                                               
% of issued share capital       0.06%            0.02%             0.09%       

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

Susan Johnson-Brett

Company Secretary

Oxford Instruments plc

Tel: [phone]

Email: [e-mail]

30 September 2009