Holding(s) in Company

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       Ignis Investment Services Limited   
notification obligation:                                                       
                                                                               
4. Full name of shareholder(s) (if                                             
different from 3):                                                             
                                                                               
5. Date of transaction (and date on                 19 December 08             
which the threshold is crossed or                                              
reached if different):                                                         
                                                                               
6. Date on which issuer notified:                   23 December 08             
                                                                               
7. Threshold(s) that is/are crossed or                    3%                   
reached:                                                                       

8: Notified Details                                                              
                                                                                 
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  Number  Number of voting Percentage of            
shares       of      of      rights           voting rights            
             voting  shares                                            
             rights                                                    
                             Direct  Indirect Direct     Indirect      
                                                                       
Ordinary                                      14,699,154          3.02 
                                                                       
Share                                                                  
                                                                       
GB0007973794                                                           

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            
                                                                               
14,699,154                              3.02                                   

9. Chain of controlled undertakings through which the voting rights and /or the
financial instruments are effectively held, if applicable:                     
                                                                               
Pearl Group Limited                                                            
                                                                               
Impala Holdings Limited                                                        
                                                                               
Pearl Group Holdings (No. 1) Ltd                                               
                                                                               
Ignis Asset Management Ltd                                                     
                                                                               
Ignis Investment Servces Ltd (indirect)                                        
                                                                               
Bank of New York Nominees Limited (1,858,924 0.38%)                            
                                                                               
Vidacos Nominees Ltd (10,940,852 2.25%)                                        
                                                                               
Mellon Bank NA (1,064,883 0.22%)                                               
                                                                               
Nortrust Nominees Ltd (383,794 0.08%)                                          
                                                                               
State Street Nominees (450,701 0.09%)                                          

Proxy Voting:                                                                  
                                                                               
10. Name of proxy holder:               N/A                                    
                                                                               
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:             Serco Group plc is disclosing this     
                                        information in accordance with DTR     
                                        5.8.12.                                
                                                                               
14 Contact name:                        Chris Winters, Assistant Company       
                                        Secretary                              
                                                                               
                                        Serco Group plc                        
                                                                               
15. Contact telephone number:           01256 744108