Director/PDMR Shareholding

NOTIFICATION OF TRANSACTIONS OF DIRECTORS' DEALINGS

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

On 17 December 2012, 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" and the Oxford
Instruments plc Senior Executive Long Term Incentive Scheme "SELTIS". In
accordance with the terms of the ESOS, all options (except for approved
options) were "net gain" settled as share appreciation rights by reference to
the mid market closing price of the Company's shares on 14 December 2012
(1380p) and the relevant option price. A number of shares from both the ESOS
and SELTIS were then sold in the market on 17 December 2012 at an average price
of 1385p, with the balance being retained by the directors, as follows:-

                     ESOS and SELTIS Options exercised and shares sold         
                                                                               
                     No. of       Base option No. of       Shares     Shares   
                     options      price       shares       sold       retained 
                     exercised                acquired                         
                                                                               
Jonathan Flint       140,000      203.5p      119,356*     157,552    31,804   
                                                                               
Chief Executive      70,000       nil         70,000                           
                                                                               
Kevin Boyd           87,629       203.5p      74,707*      110,478    11,729   
                                                                               
Finance Director     47,500       Nil         47,500                           
                                                                               
Charles Holroyd      85,000       203.5p      72,466*      101,173    13,793   
                                                                               
Executive Director   42,500       Nil         42,500                           
                                                                               
Claire Flint**       16,649       203.5p      14,194*      15,125     2,420    
                                                                               
                     3,351        203.5p      3,351                            

*shares acquired equal to "net gain"

**Claire Flint is a Connected Person to Jonathan Flint by way of marriage.

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

                      Jonathan Flint  Kevin Boyd      Charles        Claire    
                                                      Holroyd        Flint**   
                      Chief Executive Finance                                  
                                      Director        Executive                
                                                      Director                 
                                                                               
Interest in shares        159,304         66,960          64,898        534    
before notification                                                            
                                                                               
Total interest in         191,108         78,689          78,691       2,954   
shares following this                                                          
notification                                                                   
                                                                               
% of issued share          0.34%           0.14%          0.14%        0.01%   
capital                                                                        

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

17 December 2012

Susan Johnson-Brett

Company Secretary

Oxford Instruments plc

Tel: [phone]

Email: [e-mail]