Holding(s) in Company

For filings with the FSA include the annex  
For filings with issuer exclude the annex   

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     FIL Limited (FIL)                     
notification                                                                   
obligation:                                                                    
                                                                               
4. Full name of shareholder(s) (if       FIL Limited (FIL) is the parent       
different from 3):                       holding company for various direct and
                                         indirect subsdiairies, including      
                                         Fidelity Fund Management Limited      
                                         (FFML), Fidelity Investment Services  
                                         Ltd (FISL), Fidelity Gestion (FIGEST),
                                         Fidelity Investments Advisory (Korea) 
                                         Limited (FIAKL, Fidelity Investments  
                                         Management (Hong Kong) Limited        
                                         (FIMHK), Fidelity Pension Management  
                                         (FPM), Fidelity Investments Japan     
                                         (FIJ) and Fidelity Investments        
                                         International (FII) investment        
                                         managers for various non-US investment
                                         companies and institutional clients.  
                                                                               
                                         624,800 Bank of New York Brussels     
                                         (FPM)                                 
                                                                               
                                         2,103,876 Bnak of New York Europe LDN 
                                         (FIL)                                 
                                                                               
                                         530,396 Bermuda Trust Far East HK     
                                         (FIMHK)                               
                                                                               
                                         92,500 BNP Paribas, Paris (C) (FIL)   
                                                                               
                                         6,904,452 Brown Bros Harrimn Ltd Lux  
                                         (FIL)                                 
                                                                               
                                         93,400 Brown Brothers Harriman and Co 
                                         (FIJ)                                 
                                                                               
                                         113,700 Brown Brothers Harriman and Co
                                         (FIL)                                 
                                                                               
                                         147,398 HSBC Invst Bank Ltd Seoul     
                                         (FIL)                                 
                                                                               
                                         2,718,629 JP Morgan, Bournemouth (FIL)
                                                                               
                                         6,308,003 JP Morgan, Bournemouth      
                                         (FISL)                                
                                                                               
                                         1,899,800 JP Morgan, Bournemouth (FPM)
                                                                               
                                         179,800 Master Trust Bank of Japan    
                                         (FIJ)                                 
                                                                               
                                         108,628 Morgan Stanley London (FIL)   
                                                                               
                                         139,000 Normura Trust and Banking     
                                         (FIJ)                                 
                                                                               
                                         99,400 Norther Trust Co (FIL)         
                                                                               
                                         1,883,591 Norther Trust London (FPM)  
                                                                               
5. Date of transaction (and date on      7th May 2008                          
which the                                                                      
threshold is crossed or reached if                                             
different):                                                                    
                                                                               
6. Date on which issuer notified:        9th May 2008                          
                                                                               
7. Threshold(s) that is/are crossed or   5%                                    
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
                                                                                
ISIN GB        24,519,925 24,519,925                 23,947,373            4.93%
0007973794                                                                      
                                                                                

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)                   
                                                                               

Total (A+B)                                                                    

Number of voting rights                 Percentage of voting rights            
                                                                               
23,947,373                              4.93%                                  

9. Chain of controlled undertakings through which the voting rights and /or the
financial instruments are effectively held, if applicable:                     
                                                                               
FIL Limited (FIL) is the parent holding company for various direct and indirect
subsdiairies, including Fidelity Fund Management Limited (FFML), Fidelity      
Investment Services Ltd (FISL), Fidelity Gestion (FIGEST), Fidelity Investments
Advisory (Korea) Limited (FIAKL, Fidelity Investments Management (Hong Kong)   
Limited (FIMHK), Fidelity Pension Management (FPM), Fidelity Investments Japan 
(FIJ) and Fidelity Investments International (FII) investment managers for     
various non-US investment companies and institutional clients.                 

Proxy Voting:                                                                  
                                                                               
10. Name of proxy holder:           FIL Limited (FIL)                          
                                                                               
11. Number of voting rights proxy   572,552                                    
holder will cease to hold:                                                     
                                                                               
12. Date on which proxy holder will 7th May 2008                               
cease to hold voting rights:                                                   

13. Additional information:         None                                       
                                                                               
14 Contact name:                    David Merryweather                         
                                                                               
15. Contact telephone name:         [e-mail]    

For notes on how to complete form TR-1 please see the FSA website.

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in shares                               

A: Identity of the persons or legal entity subject to the notification         
obligation                                                                     

Full name                                                                      
(including legal form of legal                                                 
entities)                                                                      
                                                                               
Contact address                                                                
(registered office for legal                                                   
entities)                                                                      
                                                                               
Phone number & email                                                           
                                                                               
Other useful information                                                       
(at least legal representative                                                 
for legal persons)                                                             

B: Identity of the notifier, if applicable                                     

Full name                                                                      
                                                                               
Contact address                                                                
                                                                               
Phone number & email                                                           
                                                                               
Other useful information                                                       
                                                                               
(e.g. functional relationship                                                  
with the                                                                       
person or legal entity subject                                                 
to the                                                                         
notification obligation)                                                       

C: Additional information