Holding(s) in Company

TR-1: Notifications of Major Interests in Shares                               

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 qualifying financial instruments which  no       
may result in the acquisition of shares already issued to which                
voting rights are attached                                                     
                                                                               
An acquisition or disposal of instruments with similar economic       no       
effect to qualifying financial instruments                                     
                                                                               
An event changing the breakdown of voting rights                      no       
                                                                               
Other (please specify):                                               no       

3. Full name of person(s) subject to the   Standard Life Investments Ltd       
notification                                                                   
                                                                               
obligation:                                                                    
                                                                               
4. Full name of shareholder(s) (if         Vidacos Nominees                    
different from 3.):                                                            
                                                                               
5. Date of the transaction (and date on    27 October 2009                     
which the threshold                                                            
                                                                               
is crossed or reached):                                                        
                                                                               
6. Date on which issuer notified:          28 October 2009                     
                                                                               
7. Threshold(s) that is/are crossed or     3% DIRECT                           
reached:                                                                       

8: Notified Details                                                            
                                                                               
Voting rights attached to shares                                               
                                                                               
Class/type of share If possible use   GB0007973794                             
ISIN code                                                                      
                                                                               
Situation previous to the triggering transaction                               
                                                                               
Number of shares                      Number of voting rights                  
                                                                               
below 3%                              below 3%                                 
                                                                               
Resulting situation after the triggering transaction                           
                                                                               
Number of shares   Number of voting rights               Percentage of         
                                                         voting rights         
                                                                               
                   Direct             Indirect           Direct    Indirect    
                                                                               
14,707,853         14,707,853                            3.004%                

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

Delta

C: Financial Instruments with similar economic effect to Qualifying Financial   
Instruments                                                                     
                                                                                
Resulting situation after the triggering transaction                            
                                                                                
Type of financial  Exercise Expiration Exercise/  Number of     % of voting     
instrument         price    date       Conversion voting        rights          
                                       period     rights                        
                                                  instrument                    
                                                  refers to                     
                                                                                
                                                                Nominal         
                                                                                

Total (A+B+C)                                                                  
                                                                               
Number of voting rights                      Percentage of voting rights       
                                                                               
14,707,853                                   3.004% DIRECT                     

9. Chain of controlled undertakings through which the voting rights and/or the 
financial instruments are effectively held, if applicable:                     
                                                                               

Proxy Voting:                                                                  
                                                                               
10. Name of the proxy holder:                                                  
                                                                               
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 
                                                                               
15. Contact telephone number:       01256 744108