Holding(s) in Company

For filings with the FSA include the                                           
annex                                                                          
                                                                               
For filings with issuer exclude the                                            
annex                                                                          
                                                                               
TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                
                                                                               
1. Identity of the issuer or the underlying     UNITED UTILITIES GROUP PLC     
issuer                                                                         
of existing shares to which voting rights                                      
are                                                                            
attached: ii                                                                   
                                                                               
2 Reason for the notification (please tick the appropriate box or boxes):      
                                                                               
An acquisition or disposal of voting rights                              Yes   
                                                                               
An acquisition or disposal of qualifying financial instruments which           
may result in the acquisition of shares already issued to which voting         
rights are attached                                                            
                                                                               
An acquisition or disposal of instruments with similar economic effect         
to qualifying financial instruments                                            
                                                                               
An event changing the breakdown of voting rights                               
                                                                               
Other (please                                                                  
specify):                                                                      
                                                                               
3. Full name of person(s) subject to              Deutsche Bank AG             
the                                                                            
notification obligation: iii                                                   
                                                                               
4. Full name of shareholder(s)                                                 
(if different from 3.):iv                                                      
                                                                               
5. Date of the transaction and date                  06/12/2010                
on                                                                             
which the threshold is crossed or                                              
reached: v                                                                     
                                                                               
6. Date on which issuer notified:                    08/12/2010                
                                                                               
7. Threshold(s) that is/are crossed    Fallen below 4% and reached 3% direct   
or                                                  shareholding               
reached: vi, vii                                                               

8. Notified details:                                                                   
                                                                                       
A: Voting rights attached to shares viii, ix                                           
                                                                                       
Class/type of Situation previous     Resulting situation after the triggering          
shares        to the triggering      transaction                                       
              transaction                                                              
                                                                                       
if possible   Number     Number      Number      Number of voting       % of voting    
using         of         of          of shares   rights                 rights x       
the ISIN CODE Shares     Voting                                                        
                         Rights                  Direct xi  Indirect    Direct Indirect
                                                            xii                        
                                                                                       
GB00B39J2M42  42,370,638 42,370,638  37,825,185  26,637,297 11,187,888  3.91%   1.64%  
                                                                                       
B: Qualifying Financial Instruments                                                    
                                                                                       
Resulting situation after the triggering transaction                                   
                                                                                       
Type of financial   Expiration Exercise/            Number of voting     % of voting   
instrument          date xiii  Conversion Period    rights that may be   rights        
                               xiv                  acquired if the                    
                                                    instrument is                      
                                                    exercised/                         
                                                    converted.                         
                                                                                       
C: Financial Instruments with similar economic effect to Qualifying Financial          
Instruments xv, xvi                                                                    
                                                                                       
Resulting situation after the triggering transaction                                   
                                                                                       
Type of         Exercise Expiration Exercise Number of voting     % of voting rights   
financial       price    date xvii  /        rights instrument    xix, xx              
instrument                          Conversion refers to                                 
                                    period                                             
                                    xviii                                              
                                                                                       
Swap            N/A      N/A        N/A      103,194              Nominal        Delta 
                                                                                       
                                                                  0.02%          0.02% 
                                                                                       
Total (A+B+C)                                                                          
                                                                                       
Number of voting rights                  Percentage of voting rights                   
                                                                                       
               37,928,379                                    5.56%                     

9. Chain of controlled undertakings through which the voting rights and/or the 
financial instruments are effectively held, if applicable: xxi                 
                                                                               
Proxy Voting:                                                                  
                                                                               
10. Name of the proxy holder:                                                  
                                                                               
11. Number of voting rights proxy holder will                                  
cease                                                                          
to hold:                                                                       
                                                                               
12. Date on which proxy holder will cease to hold                              
voting rights:                                                                 
                                                                               
                                                                               
13. Additional information:                                                    
                                                                               
14. Contact name:                      Dirk Young                              
                                                                               
15. Contact telephone number:          [phone]