OXFORD INSTRUMENTS PLC: 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 notification Legal & General Group obligation: iii Plc (L&G)

4. Full name of shareholder(s) (if different from 3.): n/a iv

5. Date of the transaction and date on which the 4 February 2013 threshold is crossed or reached: v

6. Date on which issuer notified: 5 February 2013

7. Threshold(s) that is/are crossed or reached: vi, vii L&G (Above 3%)

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 xii     Direct   Indirect                             

Ordinary 5p Below 3% 1,741,585 1,741,585 3.06%

                                                                              
               (as at 19/07/                                                  
                   2012)                                                      

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 finan Exercise Expiration Exercise/ Number of voting % of voting

     cial       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      
                                                                               
               1,741,585                                 3.06%                 

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)

Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect)

Legal & General Investment Management Limited (Indirect) (LGIM)

Legal & General Group Plc (Direct) (L&G) (1,741,585 - 3.06% = LGAS, LGPL & PMC)

Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD)

Legal & General Insurance Holdings Limited (Direct) (LGIH)

Legal & General Assurance (Pensions Management) Limited (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            
                                                                               
                                                      56,872,108               

14. Contact name: Susan Johnson-Brett

15. Contact telephone number: 01865 393 200

END

-0- Feb/06/2013 08:58 GMT