Holding(s) in Company

SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES                   

All relevant boxes should be completed in block capital letters.

1. Name of company                   2. Name of shareholder having a major     
                                        interest                               
                                                                               
   Serco Group plc                      Resolution Investment Services Limited 

3. Please state whether notification 4. Name of the registered holder(s) and,  
   indicates that it is in respect      if more than one holder, the number of 
   of holding of the shareholder        shares held by each of them            
   named in 2 above or 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                                                               
                                                                               
   As in 2 above                        BNY (OCS) Nominees Limited 2,399,987   
                                                                               
                                        Vidacos Nominees Limited 16,886,482    

5. Number of      6. Percentage of  7. Number of shares 8. Percentage of      
   shares/amount     issued class      /amount of stock    issued class       
   of stock                            disposed                               
   acquired                                                                   
                                                                              
   5,116,130         1.07%             n/a                 n/a                

9. Class of security                10. Date of          11. Date company      
                                        transaction          informed          
                                                                               
   ordinary shares of 2 pence each      11 December 2006     12 DECEMBER 2006  

12. Total holding following this     13. Total percentage holding of issued    
    notification                         class following this notification     
                                                                               
    19,286,469                           4.05%                                 

14. Any additional information       15. Name of contact and telephone number  
                                         for queries                           
                                                                               
    Based on Issued Share Capital        Jayne Deegan                          
    of: 476,084,958                                                            
                                         tel: [phone]                     

16. Name and signature of authorised company official responsible for making   
    this notification                                                          
                                                                               
    As Above                                                                   
                                                                               
Date of notification 12 December 2006