Blocklisting Update

14 April 2008                                                                   



                                    G4S PLC                                     


                       BLOCK LISTING - SIX MONTHLY RETURN                       



The company refers to the announcements issued on 17 October 2007 and 12 March  
2008 concerning 900,000 and 627,790 ordinary shares respectively,  to be        
blocklisted in connection with the Securicor Executive Share Option Scheme      
(“ESOS”).                                                                       

The company also refers to the announcement issued on 1 October 2007 reporting  
that, at close of business on 28 September 2007, 1,430,111 ordinary shares for  
ESOS and 36,221 for the Securicor Sharesave Scheme (“Sharesave”) remained       
unissued.                                                                       

The company reports that, between 1 October 2007 and 31 March 2008, 480,000     
ordinary shares were issued in connection with the ESOS and no ordinary shares  
were issued in connection with Sharesave.   Thus, at close of business on 31    
March 2008, 2,477,901 ordinary shares for ESOS and 36,221 ordinary shares for   
Sharesave remained unissued.                                                    

The total number of G4S plc ordinary shares in issue at close of business on 31 
March 2008 was 1,281,190,738.                                                   



Peter David                                                                     
Company Secretary