Holding(s) in Company

NOTIFICATION OF MAJOR INTERESTS IN SHARES

1.  Name of listed company:                                                    
                                                                       
    Johnson Matthey PLC                                                        
                                                                                
2.  Name of shareholder with a major interest:                                 
                                                                                
    Aviva plc (Morley Fund Management Limited)                                 
                                                                               
3.  Please state whether notification indicates that it is regarding the       
    holding of the shareholder named in 2 above; in respect of a non-beneficial
    interest; or in the case of an individual holder if it is a holding of that
    person's spouse or children under the age of 18:                           
                                                                           
    In respect of the shareholder named in 2 above                             
                                                                               
4.  Name of the registered holder(s) and, if more than one holder, the number  
    of shares held by each of them:                                            
                                                                               
    BNY Norwich Union Nominees Limited                              1,561,973  
    BT Globenet Nominees Limited                                        6,100  
    Chase GA Group Nominees Limited                                 3,476,008  
    Chase Nominees Limited                                            228,860  
    CUIM Nominee Limited                                            1,328,037  
                                                                               
5.  Number of shares/amount of stock acquired:                                 
                                                                               
    134,627                                                                    
                                                                              
6.  Percentage of issued class (any treasury shares held by the listed company 
    should not be taken into account when calculating percentage):             
                                                                               
    0.06%                                                                      
                                                                               
7.  Number of shares/amount of stock disposed:                                 
                                                                               
    N/A                                                                        
                                                                               
8.  Percentage of issued class (any treasury shares held by the listed company 
    should not be taken into account when calculating percentage):             
                                                                               
    N/A                                                                        
                                                                              
9.  Class of security:                                                         
                                                                            
    Ordinary Shares of £1 each                                                 
                                                                               
10. Date of transaction:                                                       
                                                                             
    9 January 2007                                                             
                                                                             
11. Date listed company informed:                                              
                                                                              
    10 January 2007                                                            
                                                                              
12. Total holding following this notification:                                 
                                                                             
    6,600,978                                                                  
                                                                             
13. Total percentage holding of issued class following this notification (any  
    treasury shares held by the listed company should not be taken into account
    when calculating percentage):                                              
                                                                              
    3.01%                                                                      
                                                                               
14. Any additional information:                                                
                                                                              
    N/A                                                                        
                                                                              
15. Name of contact and telephone number for queries:                          
                                                                               
    Angela Purtill 020 7269 8461                                               
                                                                               
16. Name and signature of duly authorised officer of the listed company        
    responsible for making this notification:                                  
                                                                               
    Angela Purtill                                                             
   
    11 January 2007