Holding(s) in Company

TR-1: Notifications of Major Interests in Shares                               

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

2: Reason for notification (yes/no)                                            
                                                                               
An acquisition or disposal of voting rights                              yes   
                                                                               
An acquisition or disposal of qualifying financial instruments which     no    
may result in the acquisition of shares already issued to which                
voting rights are attached                                                     
                                                                               
An acquisition or disposal of instruments with similar economic          no    
effect to qualifying financial instruments                                     
                                                                               
An event changing the breakdown of voting rights                         no    
                                                                               
Other (please specify):                                                  no    

3. Full name of person(s) subject to the   Standard Life Investments Ltd       
notification                                                                   
                                                                               
obligation:                                                                    
                                                                               
4. Full name of shareholder(s) (if         Vidacos Nominees                    
different from 3.):                                                            
                                                                               
5. Date of the transaction (and date on    14/06/2011                          
which the threshold                                                            
                                                                               
is crossed or reached):                                                        
                                                                               
6. Date on which issuer notified:          15/06/2011                          
                                                                               
7. Threshold(s) that is/are crossed or     5%                                  
reached:                                                                       

8: Notified Details                                                            
                                                                               
 A. Voting rights attached to shares                                           
                                                                               
  * Class/type of share If possible   GB0006650450                             
    use ISIN code                                                              
                                                                               
Situation previous to the triggering transaction                               
                                                                               
  * Number of shares                    * Number of voting rights              
                                                                               
2,369,910                             2,369,910                                
                                                                               
Resulting situation after the triggering transaction                           
                                                                               
  * Number of             Number of voting rights            Percentage of     
    shares                                                   voting rights     
                                                                               
                         Direct            Indirect       Direct     Indirect  
                                                                               
    2,797,410           422,968           2,374,442       0.843%      4.732%   

 B. Qualifying Financial Instruments                                           
                                                                               
Resulting situation after the triggering transaction                           
                                                                               
    Type of       Expiration      Exercise/     No. of voting   Percentage of  
   financial         date        conversion    rights that may  voting rights  
  instrument                     period/date     be acquired                   
                                                   (if the                     
                                                 instrument                    
                                                 exercised/                    
                                                 converted)                    
                                                                               

NominalDelta

C: Financial Instruments with similar economic effect to Qualifying Financial   
Instruments                                                                     
                                                                                
Resulting situation after the triggering transaction                            
                                                                                
Type of financial  Exercise Expiration Exercise/  Number of     % of voting     
instrument         price    date       Conversion voting        rights          
                                       period     rights                        
                                                  instrument                    
                                                  refers to                     
                                                                                

Total (A+B+C)                                                                  
                                                                               
Number of voting rights                      Percentage of voting rights       
                                                                               
2,797,410                                    5.575%                            

9. Chain of controlled undertakings through which the voting rights and/or the 
financial instruments are effectively held, if applicable:                     
                                                                               

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

13. Additional information:                                                    
                                                                               
14. Contact name:                   Susan Johnson-Brett,                       
                                                                               
                                    Company Secretary, Oxford Instruments plc  
                                                                               
15. Contact telephone number:       01865 393324