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                              1,930,045*
      BT Globenet Nominees Limited                                        5,850*
      Chase GA Group Nominees Limited                                 4,907,655*
      Chase Nominees Limited                                            452,610*
      CUIM Nominee Limited                                            1,405,576*
      Tridos SICAV I Values Equity Fund                                   4,100*
      Vidacos Nominees Limited                                           15,110*
      BNP Paribas - London                                               70,000
      Chase Nominees Limited                                            692,144
      State Street Nominees Limited                                     787,492
      Triodos Meerwaarde Aandelen Fonds                                  50,000
      Triodos Meerwaarde Mixfonds                                         8,300
      Vidacos Nominees Limited                                          292,522
      White Rose Nominees Limited                                         3,380
      RC Greig Nominees Limited                                           1,300
                                                                                
      * denotes direct interest                                                 
                                                                                
5.    Date of the transaction (and date on which the threshold is crossed or    
      reached if different):                                                    
                                                                                
      24 July 2008                                                              
                                                                                
6.    Date on which issuer notified:                                            
                                                                                
      28 July 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: 13,749,083                                              
                                                                                
      Number of voting rights: 13,749,083                                       
                                                                                
      Resulting situation after the triggering transaction:                     
                                                                                
      Number of shares (direct): 8,720,946                                      
                                                                                
      Number of voting rights (direct): 8,8,720,946                             
                                                                                
      Number of voting rights (indirect): 1,905,138                             
                                                                                
      % of voting rights (direct): 4.06%                                        
                                                                                
      % of voting rights (indirect): 0.89%                                      
                                                                                
      Total voting rights: 10,626,084 shares (4.95%)                            
                                                                                
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:                                                 
                                                                                
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                                                             

29 July 2008