TR-1: Notifications of Major Interests in Shares                               

1. Identity of the issuer or the underlying issuer of existing shares to which 
voting rights are attached:                                                    
                                                                               
United Utilities Plc                                                           
                                                                               
2. Reason for notification                                       [Yes/No]      
                                                                               
An acquisition or disposal of voting rights                         Yes        
                                                                               
An acquisition or disposal of financial instruments which                      
may result in the acquisition of shares already issued to                      
which voting rights are attached                                               
                                                                               
An event changing the breakdown of voting rights                               
                                                                               
Other (please specify):                                                        
                                                                               
3. Full name of person(s) subject to         Legal & General Group Plc (L&G)   
notification obligation:                                                       
                                                                               
4. Full name of shareholder(s) (if different Legal & General Assurance         
from 3):                                     (Pensions Management) Limited     
                                             (PMC)                             
                                                                               
5. Date of transaction (and date on which    01 October 2007                   
the threshold is crossed or reached if                                         
different):                                                                    
                                                                               
6. Date on which issuer notified:            05 October 2007                   
                                                                               
7. Threshold(s) that is/are crossed or       From 3% - 4% (L&G)                
reached:                                                                       

8: Notified Details                                                            
                                                                               
A: Voting rights attached to shares                                            

Class/type   Situation previous to    Resulting situation after the triggering   
of shares       the triggering                      transaction                  
                  transaction                                                    
                                                                                 
If possible  Number of  Number of  Number of   Number of voting    Percentage of 
use ISIN     shares     voting     shares           rights         voting rights 
code                    rights                                                   
                                                                                 
                                              Direct     Indirect Direct Indirect
                                                                                 
Ord GBP 1    31,513,819 31,513,819 35,472,365 35,472,365          4.02           
                                                                                 

B: Financial Instruments                                                       
                                                                               
Resulting situation after the triggering transaction                           

Type of         Expiration     Exercise/      No. of voting     Percentage of  
financial          date        conversion    rights that may    voting rights  
instrument                    period/date    be acquired (if                   
                                             the instrument                    
                                               exercised/                      
                                               converted)                      
                                                                               

Total (A+B)                                                                    

Number of voting rights               Percentage of voting rights              
                                                                               
35,472,365                            4.02                                     

9. Chain of controlled undertakings through which the voting rights and /or the
financial instruments are effectively held, if applicable:                     
                                                                               
Legal & General Group Plc (Direct and Indirect)                                
(Group)                                                                        
                                                                               
Legal & General Investment Management (Holdings)                               
Limited (LGIMH) (Direct and Indirect)                                          
                                                                               
Legal & General Investment Management Limited                                  
(Indirect) (LGIM)                                                              
                                                                               
  Legal & General Group Plc (Direct) (L&G) (35,472,365 - 4.02% = LGAS, LGPL &  
                                     PMC)                                      
                                                                               
Legal & General Investment Management  Legal & General Insurance Holdings      
(Holdings) Limited (Direct) (LGIMHD)   Limited (Direct) (LGIH)                 
(30,654,652- 3.48%=PMC)                                                        
                                                                               
Legal & General Assurance (Pensions    Legal & General Assurance Society       
Management) Limited (PMC) (30,654,652  Limited (LGAS & LGPL)                   
- 3.48% = PMC)                                                                 
                                                                               
                                       Legal & General Pensions Limited        
                                       (Direct) (LGPL)                         

Proxy Voting:                                                                  
                                                                               
10. Name of proxy holder:                                     N/A              
                                                                               
11. Number of voting rights proxy holder will cease to hold:  N/A              
                                                                               
12. Date on which proxy holder will cease to hold voting      N/A              
rights:                                                                        

13. Additional            Notification using the total voting rights figure of 
information:              880,291,453                                          
                                                                               
                          Please note this notification has been delayed due to
                          the large number of disclosures required following a 
                          substantial amount of new business which has come to 
                          us in the form of an in-specie transfer.             
                                                                               
14 Contact name:          Helen Lewis (LGIM)                                   
                                                                               
15. Contact telephone     020 3124 3851                                        
name:                                                                          



END



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