Blocklisting - Interim Review

BLOCK LISTING SIX MONTHLY RETURN                        

Information provided on this form must be typed or printed electronically and
provided to an ris.

Date: 6 July 2011

Name of applicant:                     Oxford Instruments plc                  
                                                                               
Period of return:            From:     1 January 2011 To:     30 June 2011     
                                                                               
Name of scheme:                        ESO Scheme          Save As You Earn    
                                       (A3274711995)       Share Option Scheme 
                                                                               
Balance of unallotted securities under 322,928             116,515             
scheme(s) from previous return:                                                
                                                                               
Plus: The amount by which the block    225,000             44,610              
scheme(s) has been increased since the                                         
date of the last return (if any                                                
increase has been applied for):                                                
                                                                               
Less: Number of securities issued/     265,624             59,660              
allotted under scheme(s) during period                                         
(see LR3.5.7G):                                                                
                                                                               
Equals: Balance under scheme(s) not    282,304             101,465             
yet issued/allotted at end of period:                                          

Name of contact:                        Susan Johnson-Brett                    
                                                                               
Telephone number of contact:            01865 393324