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       1,816,305*                       
    BT Globenet Nominees Limited                 5,850*                       
    Chase GA Group Nominees Limi             4,888,936*                       
    Chase Nominees Limited                     527,210*                       
    CUIM Nominee Limited                     1,190,000*                       
    Triodos SICAV I Values Equity Fund           4,100*                       
    Vidacos Nominees Limited                    14,252*
                                                                              
    * denotes direct interest                  
                               
    BNP Paribas - London                        62,688                        
    Chase Nominees Limited                   1,307,494                       
    State Street Nominees Limi                 787,492                        
    Triodos Meerwaarde Aandelen Fonds           50,000                        
    Triodos Meerwaarde Mixfonds                  8,300                        
    Vidacos Nominees Limited                   360,789                        
    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):                                                    
                                                                              
    9 September 2008                                                          
                                                                              
6.  Date on which issuer notified:                                            
                                                                              
    10 September 2008                                                         
                                                                              
7.  Threshold(s) that is/are crossed or reached:                              
                                                                              
    <5% to 5% change at combined 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: 8,480,746                                               
                                                                              
    Number of voting rights: 8,480,746                                        
                                                                              
    Resulting situation after the triggering transaction:                     
                                                                              
    Number of shares (direct): 8,446,653                                      
                                                                              
    Number of voting rights (direct): 8,466,653                               
                                                                              
    Number of voting rights (indirect): 2,581,443                             
                                                                              
    % of voting rights (direct): 3.94%                                        
                                                                              
    % of voting rights (indirect): 1.20%                                      
                                                                              
    Total voting rights: 11,028,096 shares (5.14%)                            
                                                                              
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:

    N/A                                               
                                                                              
14. Contact Name:                                                             
                                                                              
15. Angela Purtill, Assistant Company Secretary, Johnson Matthey plc          
                                                                              
    Contact Telephone Number:                                                 
                                                                              
    020 7269 8461