Holding(s) in Company

For filings with the FSA include the annex                                     
                                                                               
For filings with issuer exclude the annex                                      

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                

1. Identity of the issuer or the underlying       Oxford Instruments plc       
issuer of existing shares to which voting                                      
rights are attached: ii                                                        

2. Reason for the notification (please tick the appropriate box or boxes):      

An acquisition or disposal of voting rights                            yes     
                                                                               
An acquisition or disposal of qualifying financial instruments which           
may result in the acquisition of shares already issued to which voting         
rights are attached                                                            
                                                                               
An acquisition or disposal of instruments with similar economic effect         
to qualifying financial instruments                                            
                                                                               
An event changing the breakdown of voting rights                               
                                                                               
Other (please                                                                  
specify):                                                                      

3. Full name of person(s) subject to the    Legal & General Group Plc (Group)  
notification obligation: iii                                                   
                                            Legal & General Investment         
                                            Management Limited                 
                                                                               
                                            (LGIM)                             
                                                                               
4. Full name of shareholder(s) (if          Legal & General Group Plc (L&G)    
different from 3.):iv                                                          
                                                                               
5. Date of the transaction and date on      17 April 2013                      
which the threshold is crossed or reached:                                     
v                                                                              
                                                                               
6. Date on which issuer notified:           18 April 2013                      
                                                                               
7. Threshold(s) that is/are crossed or      Group (Below 5%)                   
reached: vi, vii                                                               
                                            LGIM (Below 5%)                    

8. Notified details:
A: Voting rights attached to shares viii, ix

Class/type of      Situation               Resulting situation after           
shares             previous                      the triggering                
               to the triggering                  transaction                  
                  transaction                                                  
if possible                                                                    
using                    Number                Number           % of voting    
the ISIN CODE   Number     of     Number         of              rights x      
                  of     Voting     of         voting                          
                Shares   Rights   shares       rights                          
                                                                               
                                           Direct xi   Indirect  Direct  Indirect                                    
                xii                                                         
                                                                            
Ordinary 5p   2,852,830         Below 5%                                    
                                                                            
              (as at 06/02/                                                 
              2013)                                                         


B: Qualifying Financial Instruments                                            
                                                                               
Resulting situation after the triggering transaction                           

Type of financial Expiration     Exercise/      Number of voting   % of voting 
   instrument     date xiii  Conversion Period rights that may be    rights    
                                    xiv         acquired if the                
                                                 instrument is                 
                                                   exercised/                  
                                                   converted.                  
                                                                               

C: Financial Instruments with similar economic effect to Qualifying Financial  
Instruments xv, xvi                                                            
                                                                               
Resulting situation after the triggering transaction                           

    Type of     Exercise Expiration Exercise/  Number of voting    % of voting  
   financial     price   date xvii  Conversion rights instrument rights xix, xx 
  instrument                          period       refers to                    
                                      xviii                                     
                                                                                
                                                                 Nominal  Delta 
                                                                                
Total (A+B+C)                                                                   
                                                                                
Number of voting rights                  Percentage of voting rights            
                                                                                
Below 5%                                                                        
     

                                                                           
9. Chain of controlled undertakings through which the voting rights and/or the  
financial instruments are effectively held, if applicable: xxi                  
                                                                                
Legal & General Group Plc (Direct and Indirect) (Group)                         
                                                                                
(Below 5% = Total Position)                                                     
                                                                                
Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and    
Indirect) (Below 5% = Total Position)                                           
                                                                                
Legal & General Investment Management Limited (Indirect) (LGIM) (Below 5% =     
Total Position)                                                                 
                                                                                
Legal & General Group Plc (Direct) (L&G) (1,916,398 - 3.36% = LGAS, LGPL & PMC) 
                                                                                
Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD)      
(PMC)                                                                           
                                                                                
Legal & General Insurance Holdings Limited (Direct) (LGIH)                      
                                                                                
Legal & General Assurance (Pensions Management) Limited (PMC) (PMC)             
                                                                                
Legal & General Assurance Society Limited (LGAS & LGPL)                         
                                                                                
Legal & General Pensions Limited (Direct) (LGPL)                                

Proxy Voting:                                                                  
                                                                               
10. Name of the proxy holder:           n/a                                    
                                                                               
11. Number of voting rights proxy       n/a                                    
holder will cease to hold:                                                     
                                                                               
12. Date on which proxy holder will     n/a                                    
cease to hold voting rights:                                                   

13. Additional information:             Notification using the total voting    
                                        rights figure of                       
                                                                               
                                        56,916,830                             
                                                                               
14. Contact name:                       Susan Johnson-Brett                    
                                                                               
15. Contact telephone number:           01865 393 200