Blocklisting - Interim Review

BLOCK LISTING SIX MONTHLY RETURN                        

Information provided on this form must be typed or printed electronically and
provided to an ris.

Date: _2 August______2010__

Name of applicant:                     UNITED UTILITIES GROUP PLC              
                                                                               
Name of schemes:                       United Utilities Group 2008 Savings     
                                       related share Option Scheme, United     
                                       Utilities Group 2008 Performance Share  
                                       Plan, United Utilities Group 2008       
                                       Matching Share Award Plan, United       
                                       Utilities PLC Approved Share Option Plan
                                       1999, United Utilities PLC Unapproved   
                                       Share Option Plan 1999, United Utilities
                                       Executive Share Option Scheme and United
                                       Utilities PLC Overseas Executive Share  
                                       Option Scheme.                          
                                                                               
Period of return:            From:     01/02/2010      To:    31/07/2010       
                                                                               
Balance of unallotted securities under 9,845,201                               
scheme(s) from previous return:                                                
                                                                               
Plus: The amount by which the block    NIL                                     
scheme(s) has been increased since the                                         
date of the last return (if any                                                
increase has been applied for):                                                
                                                                               
Less: Number of securities issued/     12,059                                  
allotted under scheme(s) during period                                         
(see LR3.5.7G):                                                                
                                                                               
Equals: Balance under scheme(s) not    9,833,142                               
yet issued/allotted at end of period:                                          

Name of contact:                        Jane Gilmore                           
                                                                               
Telephone number of contact:            01925 237052