Holding(s) in Company

Serco Group plc ("Serco") received on 22 March 2007 from Fidelity International
Limited a notification of their interests in Serco Ordinary Shares of 2p each
dated 22 March 2007. The disclosure of their interest is in accordance with
DTR5 is below.

This notice is given in fulfillment of Serco's obligations under DTR 5.8.12.

1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached (ii): SERCO GROUP PLC

2. Reason for the notification                                State            
                                                              Yes/No           
                                                                               
An acquisition or disposal of voting rights                                    
                                                                               
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):                             Restatement of historical  
                                                   interest in compliance with 
                                                   the FSA's new disclosure and
                                                        Transparency rules     

3. Full name of person(s) subject to the              Fidelity International   
notification obligation (iii):                               Limited           
                                                                               
4. Full name of shareholder(s) (if different from         See section 9        
3.) (iv):                                                                      
                                                                               
5. Date of the transaction (and date on which the    Revised due to DTR rules  
threshold is crossed                                                           
or reached if different) (v):                                                  
                                                                               
6. Date on which issuer notified:                         22 March 2007        
                                                                               
7. Threshold(s) that is/are crossed or reached:                N/A             
                                                                               
8. Notified details:                                                           

A: Voting rights attached to shares

Class/type Situation previous to     Resulting situation after the triggering    
of shares     the Triggering                    transaction (vii)                
    if       transaction (vi)                                                    
 possible                                                                        
using the                                                                        
ISIN CODE                                                                        
                                                                                 
             Number     Number    Number   Number of voting       % of voting    
               of         of        of        rights (ix)           rights       
             Shares     Voting    shares                                         
                        Rights                                                   
                        (viii)                                                   
                                                                                 
                                  Direct   Direct   Indirect  Direct   Indirect  
                                            (x)       (xi)                       
                                                                                 
 GBP Ord   42,881,993 42,881,993                   42,881,993           8.99%    
   0.02                                                                          
                                                                                 

B: Financial Instruments

Resulting situation after the triggering transaction (xii)

  Type of     Expiration     Exercise/       Number of voting     % of voting  
 financial   date (xiii)     Conversion     rights that may be      rights     
 instrument                 Period/ Date     acquired if the                   
                               (xiv)            instrument                     
                                              is exercised/                    
                                                converted                      
                                                                               

Total (A+B)                                                                    
                                                                               
Number of voting rights              % of voting rights                        
                                                                               
42,881,993                           8.99                                      

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

See Section 4                                                                  
                                                                               
Fidelity Internal Limited (FIL) is       323,700   STATE STR BANK AND TR    FPM
the parent holding company for                     CO LNDN (S                  
various diret and indirect                                                     
subsdiairies, including Fidelity Fund                                          
Management Limited (FFML), Fidelity      152,786   STATE STR BANK AND TR    FIL
Investment Services Ltd (FISL),                    CO LNDN (S                  
Fidelity Gestion (FIGEST), Fidelity                                            
Investments Advisory (Korea) Limited                                           
(FIAKL, Fidelity Investments           2,338,191   NORTHERN TRUST LONDON    FPM
Management (Hong Kong) Limited                                                 
(FIMHK), Fidelity Pension Management                                           
(FPM), Fidelity Investments Japan      2,574,042   JP MORGAN, BOURNEMOUTH   FPM
(FIJ) and Fidelity Investments                                                 
International (FII) investment                                                 
managers for various non-US           12,071,526   JP MORGAN, BOURNEMOUTH  FISL
investment companies and                                                       
institutional clients.                                                         
                                       5,464,329   JP MORGAN, BOURNEMOUTH   FIL
                                                                               
                                                                               
                                      17,076,914   BROWN BROS HARRIMN LTD   FIL
                                                   LUX                         
                                                                               
                                                                               
                                         116,500   BNP PARIBAS, PARIS (C)   FIL
                                                                               
                                       2,034,076   BANK OF NEW YORK         FIL
                                                   EUROPE LDN                  
                                                                               
                                         729,929   BANK OF NEW YORK         FPM
                                                   BRUSSELS                    

Proxy Voting:


10. Name of the proxy holder:                    Fidelity International Limited
                                                 (FIL)                         
                                                                               
11. Number of voting rights proxy holder will    N/A                           
cease to hold:                                                                 
                                                                               
12. Date on which proxy holder will cease to     N/A                           
hold voting rights:                                                            

13. Additional information:                 As discussed with the FSA, prior to the
                                            implementation of the EU Transparency  
                                            Directive, we aggregated the interests 
                                            of FMR Corp (FMR) and Fidelity         
                                            International Limited (FIL) together   
                                            for the purposes of shareholder        
                                            reporting. According to the new DTR    
                                            rules we are now reporting the indirect
                                            holdings of FMR and FIL separately. A  
                                            separate notification is being         
                                            submitted for FMR Corp. Please note    
                                            these holdings are correct as of close 
                                            of business 20 March 2007.             
                                                                                   
14. Contact name:                           Sophie Hughes                          
                                                                                   
15. Contact telephone number:               [e-mail]

Annex Notification Of Major Interests In Shares (xvi)


A: Identity of the person or legal entity subject to the                       
notification obligation                                                        
                                                                               
Full name (including legal form for legal entities)                            
                                                                               
Contact address (registered office for legal entities)                         
                                                                               
Phone number                                                                   
                                                                               
Other useful information (at least legal representative                        
for legal persons)                                                             
                                                                               
B: Identity of the notifier, if applicable (xvii)                              
                                                                               
Full name                                                 Jayne Deegan         
                                                                               
Contact address                                                                
                                                                               
Phone number                                              01256 744272         
                                                                               
Other useful information (e.g. functional relationship    Assistant Company    
with the person                                           Secretary            
or legal entity subject to the notification obligation)                        

C: Additional information



Notes

i. This form is to be sent to the issuer or underlying issuer and to be filed
with the competent authority.

ii. Either the full name of the legal entity or another method for identifying
the issuer or underlying issuer, provided it is reliable and accurate.

iii. This should be the full name of (a) the shareholder; (b) the person
acquiring, disposing of or exercising voting rights in the cases provided for
in DTR5.2.1 (b) to (h); (c) all the parties to the agreement referred to in
DTR5.2.1 (a), or (d) the direct or indirect holder of financial instruments
entitled to acquire shares already issued to which voting rights are attached,
as appropriate.

In relation to the transactions referred to in points DTR5.2.1 (b) to (h), the
following list is provided as indication of the persons who should be
mentioned:

- in the circumstances foreseen in DTR5.2.1 (b), the person that acquires the
voting rights and is entitled to exercise them under the agreement and the
natural person or legal entity who is transferring temporarily for
consideration the voting rights;

- in the circumstances foreseen in DTR 5.2.1 (c), the person holding the
collateral, provided the person or entity controls the voting rights and
declares its intention of exercising them, and person lodging the collateral
under these conditions;

- in the circumstances foreseen in DTR5.2.1(d), the person who has a life
interest in shares if that person is entitled to exercise the voting rights
attached to the shares and the person who is disposing of the voting rights
when the life interest is created;

- in the circumstances foreseen in DTR5.2.1 (e), the parent undertaking and,
provided it has a notification duty at an individual level under DTR 5.1, under
DTR5.2.1 (a) to (d) or under a combination of any of those situations, the
controlled undertaking;

- in the circumstances foreseen in DTR5.2.1 (f), the deposit taker of the
shares, if he can exercise the voting rights attached to the shares deposited
with him at his discretion, and the depositor of the shares allowing the
deposit taker to exercise the voting rights at his discretion;

- in the circumstances foreseen in DTR5.2.1 (g), the person that controls the
voting rights;

- in the circumstances foreseen in DTR5.2.1 (h), the proxy holder, if he can
exercise the voting rights at his discretion, and the shareholder who has given
his proxy to the proxy holder allowing the latter to exercise the voting rights
at his discretion.

iv. Applicable in the cases provided for in DTR 5.2.1 (b) to (h). This should
be the full name of the shareholder or holder of financial instruments who is
the counterparty to the natural person or legal entity referred to in DTR5.2.

v. The date of the transaction should normally be, in the case of an on
exchange transaction, the date on which the matching of orders occurs; in the
case of an off exchange transaction, date of the entering into an agreement.

The date on which threshold is crossed should normally be the date on which the
acquisition, disposal or possibility to exercise voting rights takes effect
(see DTR 5.1.1R (3)). For passive crossings, the date when the corporate event
took effect. [DEL::DEL]

These dates will usually be the same unless the transaction is subject to a
condition beyond the control of the parties.

vi. Please refer to the situation disclosed in the previous notification, In
case the situation previous to the triggering transaction was below 3%, please
state `below 3%'.

vii. If the holding has fallen below the minimum threshold , the notifying
party should not be obliged to disclose the extent of the holding, only that
the new holding is less than 3%.

For the case provided for in DTR5.2.1(a), there should be no disclosure of
individual holdings per party to the agreement unless a party individually
crosses or reaches an Article 9 threshold. This applies upon entering into,
introducing changes to or terminating an agreement.

viii. Direct and indirect

ix In case of combined holdings of shares with voting rights attached `direct
holding' and voting rights `indirect holdings', please split the voting rights
number and percentage into the direct and indirect columns-if there is no
combined holdings, please leave the relevant box blank.

x Voting rights attached to shares in respect of which the notifying party is a
direct shareholder (DTR 5.1)

xi. Voting rights held by the notifying party as an indirect shareholder (DTR
5.2.1)

xii If the holding has fallen below the minimum threshold, the notifying party
should not be obliged to disclose the extent of the holding, only that the new
holding is below 3%.

xiii date of maturity / expiration of the finical instrument i.e. the date when
the right to acquire shares ends.

xiv If the financial instrument has such a period-please specify the period-
for example once every three months starting from the [date]

xv. The notification should include the name(s) of the controlled undertakings
through which the voting rights are held. The notification should also include
the amount of voting rights and the percentage held by each controlled
undertaking, insofar as individually the controlled undertaking holds 3% or
more, and insofar as the notification by the parent undertaking is intended to
cover the notification obligations of the controlled undertaking.

xvi. This annex is only to be filed with the competent authority.

xvii. Whenever another person makes the notification on behalf of the
shareholder or the natural person/legal entity referred to in DTR5.2 and
DTR5.3.