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 PERFORMANCE SHARE PLAN    
                                    SCHEME                                     
                                                                               
Period of return:          From:    01.08.2007     To:   31.1.2008             
                                                                               
Balance under scheme from previous  1,903,429                                  
return:                                                                        
                                                                               
The amount by which the block       Nil                                        
scheme has been increased, if the                                              
scheme has been increased since the                                            
date of the last return:                                                       
                                                                               
Number of securities issued/        Nil                                        
allotted under scheme during                                                   
period:                                                                        
                                                                               
Balance under scheme not yet issued 1,903,429                                  
/allotted at end of period                                                     
                                                                               
Number and class of securities      JUNE 2005 - 3,000,000                      
originally listed and the date of                                              
admission                                                                      
                                                                               
Total number of securities in issue 880,730,308                                
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.