Director/PDMR Shareholding

Oxford Instruments plc                             

                              Directors' Dealings                              

Oxford Instruments plc announces that on 28 April 2011 the following executive
directors purchased ordinary shares of 5 pence at a cost of 747.25p per share
as "partnership shares" under the all-employee Oxford Instruments Share
Incentive Plan as summarised below:

       Executive Director            No. of Partnership Shares acquired    
                                                                           
           Kevin Boyd                                16                    
                                                                           
         Jonathan Flint                              16                    
                                                                           
        Charles Holroyd                              16                    

In connection with the above purchases of Partnership Shares on the same date
the executive directors were awarded ordinary shares of 5 pence as "matching
shares" under the all employee Oxford Instruments Share Incentive Plan as
summarised below:

       Executive Director              No. of Matching Shares awarded      
                                                                           
           Kevin Boyd                                3                     
                                                                           
         Jonathan Flint                              3                     
                                                                           
        Charles Holroyd                              3                     

To fully hedge the above awards the Trustee of the Oxford Instruments Share
Incentive Plan purchased such number of shares in the open market at a cost of
747.25p per share.

The risk of forfeiture attached to the matching shares will normally be removed
on the third anniversary of allocation subject to continued employment and the
retention of the partnership shares in connection with which they were awarded.
No consideration was paid by the grantees for the award of the matching shares
and no consideration is due on the release of the matching shares.

On the same date, the executive directors applied dividends paid on shares held
in the Oxford Instruments Share Incentive Plan to purchase ordinary shares of 5
pence at a cost of 747.25p per share as "dividend shares" under the
all-employee Oxford Instruments Share Incentive Plan as summarised below:

       Executive Director             No. of Dividend Shares acquired      
                                                                           
           Kevin Boyd                                8                     
                                                                           
         Jonathan Flint                              8                     
                                                                           
        Charles Holroyd                              8                     

The above transactions were undertaken by the trustee of the Oxford Instruments
Share Incentive Plan, a UK registered company, on behalf of the above
individuals and the shares were purchased on the London Stock Exchange.

The above notifications are made in accordance with Rule 3.1.4 of the UKLA
Disclosure Rules and Transparency Rules.

Oxford Instruments plc was notified of the above transactions on 3 May 2011.

Name of contact and telephone number for queries: Susan Johnson-Brett, 01865
393324.

For and on behalf of Oxford Instruments plc

Date: 3 May 2011