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                  1,573,440*         
      BT Globenet Nominees Limited                            2,350*         
      Chase GA Group Nominees Limited                     4,652,173*         
      Chase Nominees Limited                                286,184*         
      CUIM Nominee Limited                                1,042,414*         
      Delta Lloyd Leven Quant                                 4,966*         
      Triodos SICAV I Values Equity Fund                      4,100*         
      Vidacos Nominees Limited                               14,252*
                                                                             
      * denotes direct interest                                              
                                                                             
      BNP Paribas - London                                   70,133          
      Chase Nominees Limited                              1,211,137          
      State Street Nominees Limited                       1,058,474          
      Triodos Meerwaarde Aandelen Fonds                      50,000          
      Triodos Meerwaarde Mixfonds                             9,490          
      Vidacos Nominees Limited                              463,369          
      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):                                                 
                                                                             
      3 April 2009                                                           
                                                                             
6     Date on which issuer notified:                                         
                                                                             
      6 April 2009                                                           
                                                                             
7     Threshold(s) that is/are crossed or reached:                           
                                                                             
      5% to 4% 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: 11,285,642                                           
                                                                             
      Number of voting rights: 11,285,642                                    
                                                                             
      Resulting situation after the triggering transaction:                  
                                                                             
      Number of shares (direct): 7,579,879                                   
                                                                             
      Number of voting rights (direct): 7,579,879                            
                                                                             
      Number of voting rights (indirect): 2,867,283                          
                                                                             
      % of voting rights (direct): 3.53%                                     
                                                                             
      % of voting rights (indirect): 1.34%                                   
                                                                             
      Total voting rights: 10,447,162 shares (4.87%)                         
                                                                             
9     Chain of controlled undertakings through which the voting rights and/or
      the financial instruments are effectively held if applicable:          
                                                                             
      The voting rights are managed and controlled by Aviva Investors Global 
      Services Limited & Delta Lloyd Asset Management NV , with the following
      chain of controlled undertakings:-                                     
                                                                             
      Aviva Investors Global Services Limited:                               
                                                                             
        * Aviva plc (Parent Company)                                         
        * Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)
        * Aviva Investors Holdings Limited (wholly owned subsidiary of Aviva 
          Group Holdings Limited)                                            
        * Aviva Investors Global Services Limited (wholly owned subsidiary of
          Aviva Investors Holdings Limited)                                  
                                                                             
      Delta Lloyd Asset Management NV:                                       
        * Aviva plc (Parent Company)                                         
        * Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)
        * Aviva International Insurance Limited (wholly owned subsidiary of  
          Aviva Group Holdings Limited)                                      
        * Aviva Insurance Limited (wholly owned subsidiary of Aviva          
          International Insurance Limited)                                   
        * Aviva International Holdings Limited (wholly owned subsidiary of   
          Aviva Insurance Limited)                                           
        * CGU International Holdings BV (wholly owned subsidiary of Aviva    
          International Holdings Limited)                                    
        * Delta Lloyd NV (majority owned subsidiary of CGU International     
          Holdings BV)                                                       
        * Delta Lloyd Asset Management NV (wholly owned subsidiary of Delta  
          Lloyd NV)                                                          
                                                                             
      The investments are administered by Commercial Union Trustees Limited, 
      with the following chain of control:                                   
                                                                             
      Commercial Union Trustees Limited:                                     
        * Aviva plc (Parent Company)                                         
        * Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)
        * Undershaft Limited (wholly owned subsidiary of Aviva Group Holdings
          Limited)                                                           
        * Commercial Union Trustees Limited (wholly owned subsidiary of      
          Undershaft Limited)                                                
                                                                             
      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:      
                                                    
      Angela Purtill, Assistant Company Secretary, Johnson Matthey plc       
                                                                             
      Contact Telephone Number:                                              
                                                                             
      020 7269 8461