Holding(s) in Company

TR-1: Notifications of Major Interests in Shares                               

1. Identity of the issuer or the underlying issuer of existing                 
shares to which voting rights are attached:                                    
                                                                               
Serco Group plc                                                                
                                                                               
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     Legal & General Group Plc (L&G)       
notification                                                                   
obligation:                                                                    
                                                                               
4. Full name of shareholder(s) (if       N/A                                   
different from 3):                                                             
                                                                               
5. Date of transaction (and date on      31 May 2012                           
which the                                                                      
threshold is crossed or reached if                                             
different):                                                                    
                                                                               
6. Date on which issuer notified:        01 June 2012                          
                                                                               
7. Threshold(s) that is/are crossed or   L&G (Below 3%)                        
reached:                                                                       

8: Notified Details                                                            
                                                                               
A: Voting rights attached to shares                                            

Class/type of  Situation previous to Resulting situation after                 
shares         the triggering        the triggering transaction                
               transaction                                                     
                                                                               
If possible    Number of  Number of  Number   Number of         Percentage of  
use            shares     voting     of       voting rights     voting rights  
ISIN code                 rights     shares                                    
                                                                               
                                              Direct  Indirect  Direct Indirect
                                                                               
Ord 2p         19,554,471            Below 3%                                  
                                                                               
               (As on 14/10/2009)                                              

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)                        
                                                                               

Delta

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

Total (A+B+C)                                                                  

Number of voting rights                 Percentage of voting rights            
                                                                               
Below 3%                                                                       

9. Chain of controlled undertakings through which the voting rights and /or the
financial instruments are effectively held, if applicable:                     
                                                                               
Legal & General Group Plc (Direct and Indirect) (Group)                        
                                                                               
Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and   
Indirect)                                                                      
                                                                               
Legal & General Investment Management Limited (Indirect) (LGIM)                
                                                                               
Legal & General Group Plc (Direct) (L&G) (Below 3% = LGAS, LGPL & PMC)         
                                                                               
Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD)     
                                                                               
Legal & General Insurance Holdings Limited (Direct) (LGIH)                     
                                                                               
Legal & General Assurance (Pensions Management) Limited (PMC)                  
                                                                               
Legal & General Assurance Society Limited (LGAS & LGPL)                        
                                                                               
Legal & General Pensions Limited (Direct) (LGPL)                               

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:                    Chris Winters, Deputy Company Secretary    
                                                                               
15. Contact telephone name:         01256 744108