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 or disposal 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                    1,690,745*       
      BT Globenet Nominees Limited                              5,850*         
      Chase GA Group Nominees Limited                       4,907,655*   
      Chase Nominees Limited                                  451,710*       
      CUIM Nominee Limited                                  1,405,576*     
      Tridos SICAV I Values Equity Fund                         4,100*     
      Vidacos Nominees Limited                                 15,110*
                                                                                
      * denotes direct interest                                                 
                                                                                
5.    Date of the transaction (and date on which the threshold is crossed or    
      reached if different):                                                    
                                                                                
      29 July 2008                                                              
                                                                                
6.    Date on which issuer notified:                                            
                                                                                
      1 August 2008                                                             
                                                                                
7.    Threshold(s) that is/are crossed or reached:                              
                                                                                
      4% to 3% 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: 10,626,084                                              
                                                                                
      Number of voting rights: 10,626,084                                       
                                                                                
      Resulting situation after the triggering transaction:                     
                                                                                
      Number of shares (direct): 8,480,746                                      
                                                                                
      Number of voting rights (direct): 8,480,746                               
                                                                                
      Number of voting rights (indirect): Not disclosable                       
                                                                                
      % of voting rights (direct): 3.95%                                        
                                                                                
      % of voting rights (indirect): Not disclosable                            
                                                                                
      Total voting rights: 8,480,746 (3.95%)                                    
                                                                                
9.    Chain of controlled undertakings through which the voting rights and/or   
      the financial instruments are effectively held if applicable:             
                                                                                
      See section 4                                                             
                                                                                
10.   Name of the proxy holder: See Section 4                                   
                                                                                
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:                                                             
                                                                                
15.   Angela Purtill, Assistant Company Secretary, Johnson Matthey plc          
                                                                                
      Contact Telephone Number:                                                 
                                                                                
      020 7269 8461                                                             

1 August 2008