Holding(s) in Company

NOTIFICATION OF MAJOR INTERESTS IN SHARES

1.  Identity of the issuer or the underlying issuer of existing shares to     
    which voting rights are attached:                                         
                                                                              
    Johnson Matthey plc                                                       
                                                                              
2.  Reason for the notification:                                              
                                                                              
    An acquisition of voting rights.                                          
                                                                              
3.  Full name of person(s) subject to the notification obligation:            
                                                                              
    Aviva plc and its subsidiaries                                            
                                                                              
4.  Full name of shareholder(s) (if different from 3.):                       
                                                                              
    BNY Norwich Union Nominees Limited        1,882,489*                  
    BT Globenet Nominees Limited                  5,850*                   
    Chase GA Group Nominees Limite            5,081,807*                    
    Chase Nominees Limited                      549,257*                    
    CUIM Nominee Limited                      1,231,348*                 
    Triodos SICAV I Values Equity Fund            4,100*                
    Vidacos Nominees Limited                     14,252*
                                                                              
    * denotes direct interest                                                 
                                                                              
    BNP Paribas - Lon                            62,688                  
    Chase Nominees Limited                    1,359,138                       
    State Street Nominees Limite                774,180                    
    Triodos Meerwaarde Aandelen                  50,000                  
    Triodos Meerwaarde Mixfonds                   8,300                     
    Vidacos Nominees Limited                    369,896                    
    White Rose Nominees Limited                   3,380                
    RC Greig Nominees Limited                     1,300
                                                                              
5.  Date of the transaction (and date on which the threshold is crossed or    
    reached if different):                                                    
                                                                              
    15 September 2008                                                         
                                                                              
6.  Date on which issuer notified:                                            
                                                                              
    17 September 2008                                                         
                                                                              
7.  Threshold(s) that is/are crossed or reached:                              
                                                                              
    3% to 4% change at Direct Interest Level                                  
                                                                              
8.  Notified details:                                                         
                                                                              
    VOTING RIGHTS ATTACHED TO SHARES:                                         
                                                                              
    Class/type of shares (if possible using the ISIN CODE):                   
                                                                              
    GB0004764071                                                              
                                                                              
    Situation previous to the triggering transaction:                         
                                                                              
    Number of shares: 11,028,096                                              
                                                                              
    Number of voting rights: 11,028,096                                       
                                                                              
    Resulting situation after the triggering transaction:                     
                                                                              
    Number of shares (direct): 8,769,103                                      
                                                                              
    Number of voting rights (direct): 8,769,103                               
                                                                              
    Number of voting rights (indirect): 2,628,882                             
                                                                              
    % of voting rights (direct): 4.09%                                        
                                                                              
    % of voting rights (indirect): 1.22%                                      
                                                                              
    Total voting rights: 11,397,985 shares (5.31%)                            
                                                                              
9.  Chain of controlled undertakings through which the voting rights and/or   
    the financial instruments are effectively held if applicable:             
                                                                              
    See Section 4                                                             
                                                                              
    PROXY VOTING:                                                             
                                                                              
10. Name of the proxy holder:                                                 
                                                                              
    See Section 4                                                             
                                                                              
11. Number of voting rights proxy holder will cease to hold:                  
                                                                              
    N/A                                                                       
                                                                              
12. Date on which proxy holder will cease to hold voting rights:              
                                                                              
    N/A                                                                       
                                                                              
13. Additional Information                                                    
                                                                              
14. Contact Name:                                                             
                                                                              
15. Angela Purtill, Assistant Company Secretary, Johnson Matthey plc          
                                                                              
    Contact Telephone Number:                                                 
                                                                              
    020 7269 8461