Major Interests in Shares

TR-1: Notifications of Major Interests in Shares                               

1. Identity of the issuer or the underlying             Serco Group plc        
issuer of existing shares to which voting                                      
rights are attached:                                                           
                                                                               
2. Reason for notification (yes/no)                                            
                                                                               
An acquisition or disposal of voting rights                             Yes    
                                                                               
An acquisition or disposal of financial instruments which may result           
in the acquisition of shares already issued to which voting rights             
are attached                                                                   
                                                                               
An event changing the breakdown of voting rights                               
                                                                               
Other (please specify):______________                                          
                                                                               
3. Full name of person(s) subject to     Newton Investment Management Limited  
notification obligation:                                                       
                                                                               
4. Full name of shareholder(s) (if                                             
different from 3):                                                             
                                                                               
5. Date of transaction (and date on                 12 January 2009            
which the threshold is crossed or                                              
reached if different):                                                         
                                                                               
6. Date on which issuer notified:                   14 January 2009            
                                                                               
7. Threshold(s) that is/are crossed or       Decrease from 6.00% to 5.93%      
reached:                                                                       

8: Notified Details Sale of 311,811 shares                                       
                                                                                 
A: Voting rights attached to shares                                              
                                                                                 
Class/type  Situation previous  Resulting situation after the triggering         
of shares   to the triggering   transaction                                      
            transaction                                                          
If possible                                                                      
use ISIN                                                                         
code                                                                             
                                                                                 

          Number of Number of  Number   Number of voting  Percentage of              
          shares    voting     of       rights            voting rights              
                    rights     shares                                                
                                                                           
                                        Direct   Indirect Direct     Indirect        
                                                                           
Ordinary  29,216,875 6.00%    n/a      n/a      28,905,064 n/a        5.93%  
                                                                           
Shares                                                                     
                                                                           
Sedol                                                                      
                                                                           
0797379                                                                    

B: Financial Instruments                                                       
                                                                               
Resulting situation after the triggering transaction                           
                                                                               
Type of        Expiration     Exercise/       No. of voting      Percentage of 
financial      date           conversion      rights that may be voting rights 
instrument                    period/date     acquired (if the                 
                                              instrument                       
                                              exercised/                       
                                              converted)                       
                                                                               
N/A                                                                            

Total (A+B)                                                                    
                                                                               
Number of voting rights                 Percentage of voting rights            
                                                                               
28,905,064                              5.93%                                  

9. Chain of controlled undertakings through which the voting rights and /or the 
financial instruments are effectively held, if applicable:                      
                                                                                
Newton Investment Management Limited hold these shares as a discretionary       
Investment Manager                                                              

Proxy Voting:                                                                  
                                                                               
10. Name of proxy holder:               N/A                                    
                                                                               
11. Number of voting rights proxy       N/A                                    
holder will cease to hold:                                                     
                                                                               
12. Date on which proxy holder will     N/A                                    
cease to hold voting rights:                                                   

13. Additional information:             Serco Group plc is disclosing this     
                                        information in accordance with DTR     
                                        5.8.12.                                
                                                                               
14 Contact name:                        Sarah Howfield, Company Secretarial    
                                        Assistant                              
                                                                               
15. Contact telephone number:           01256 744272