Director/PDMR Shareholding

NOTIFICATION OF TRANSACTIONS OF DIRECTORS' DEALINGS

Oxford Instruments plc (the "Company") announces that on 17 September 2010 the
following directors' dealings took place:

The following directors acquired ordinary shares of 5p each in the Company
following the exercise of options granted under the Oxford Instruments Senior
Executive Long Term Incentive Scheme "SELTIS" and the Oxford Instruments 2001
Executive Share Option Scheme "ESOS". They each sold sufficient of the shares
to meet the option price and tax liability (as applicable) and broker's costs
at a sale price of 430p per share.

                           Jonathan Flint   Kevin Boyd       Charles Holroyd   
                                                                               
                           Chief Executive  Finance Director Executive Director
                                                                               
SELTIS options                                                                 
                                                                               
- No exercised                  25,000           6,250             6,250       
                                                                               
- Option price                   Nil              Nil               Nil        
                                                                               
ESOS options                                                                   
                                                                               
- No exercised                  6,712            7,361               -         
                                                                               
- Option price                  £2.19           £2.0375              -         
                                                                               
Shares sold to meet option      16,227           6,700             3,199       
price, tax liability &                                                         
broker's cost                                                                  
                                                                               
Shares retained                 15,485           6,911             3,051       

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
                                                                               
Total interest in shares        46,461           17,677            51,497      
following this                                                                 
notification                                                                   
                                                                               
% of issued share capital       0.09%            0.04%             0.10%       

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

20 September 2010

Susan Johnson-Brett

Company Secretary

Oxford Instruments plc

Tel: [phone]

Email: [e-mail]