Blocklisting - Interim Review

BLOCK LISTING SIX MONTHLY RETURN                        

Information provided on this form must be typed or printed electronically.

To: The FSA

Date: _31 January 2008

Name of applicant:                 UNITED UTILITIES PLC                        
                                                                               
Name of scheme:                    UNITED UTILITIES EXECUTIVE SHARE OPTION     
                                   SCHEME                                      
                                                                               
Period of return:          From:   01.08.2007      To:   31.1.2008             
                                                                               
Balance under scheme from previous 2,847,332                                   
return:                                                                        
                                                                               
The amount by which the block      1,000,000                                   
scheme has been increased, if the                                              
scheme has been increased since                                                
the date of the last return:                                                   
                                                                               
Number of securities issued/       424,097                                     
allotted under scheme during                                                   
period:                                                                        
                                                                               
Balance under scheme not yet       3,423,235                                   
issued/allotted at end of period                                               
                                                                               
Number and class of securities     MARCH 1991- 1,000,000, DECEMBER 1994 -      
originally listed and the date of  4,600,000, FEBRUARY 1998 2,500,000, JANUARY 
admission                          2001 -2,000,000 JANUARY 2002 - 2,750,000,   
                                   JANUARY 2003 - 2,000,000 FEBRUARY 2005 -    
                                   3,000,000, JANUARY 2006 - 300,000 SEPTEMBER 
                                   2006 - 3,000,000, FEBRUARY 2007 - 500,000,  
                                   MARCH 2007 - 250,000, APRIL 2007 - 250,000  
                                                                               
Total number of securities in      880,730,308                                 
issue at the end of the period                                                 

Name of contact:                        J Gilmore                              
                                                                               
Address of contact:                     Haweswater House, Lingley Mere Business
                                        Park, Great Sankey, Warrington         
                                                                               
                                        WA5 3LP                                
                                                                               
Telephone number of contact:            01925 237052                           

SIGNED BY P Davies___________________________________

Assistant Company Secretary

for and on behalf of

UNITED UTILITIES PLC

If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.