Rule 2.10 Announcement

21 December 2004

                      TO BE MADE BY LAZARD & CO., LIMITED                      

                         ON BEHALF OF SERCO GROUP PLC                          

                            RULE 2.10 ANNOUNCEMENT                             

In accordance with Rule 2.10 of the City Code on Takeovers and Mergers, Serco
Group plc ('Serco') confirms that its current issued share capital comprises
435,316,163 ordinary shares of 2p each.

The International Securities Identification Number of Serco ordinary shares is
GB0007973794.

END

ITNET shareholders

Serco Group plc                                                              
                                                                             
Dominic Cheetham, Director of Corporate Communications                       
                                                                             
Richard Hollins, Head of Investor Relations                                  
                                                                             
Lazard & Co., Limited (Financial       [phone]                   
Adviser to Serco)                                                            
                                                                             
Paul Jameson                                                                 
                                                                             
Samuel Bertrand                                                              
                                                                             
Weber Shandwick Square Mile            [phone]                   
                                                                             
Louise Robson                                                                

Terms used in this announcement shall have the same meaning as those in the
Offer Document.