TIDMUU. 
 
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 issuer   United Utilites Group PLC 
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                    X 
 
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                    BlackRock, Inc. 
the notification obligation: iii 
 
4. Full name of shareholder(s) 
(if different from 3.):iv 
 
5. Date of the transaction and date on                 1st December 2009 
which the threshold is crossed or 
reached: v 
 
6. Date on which issuer notified:                     29th December 2009 
 
7. Threshold(s) that is/are crossed or             Holding has gone above 5% 
reached: vi, vii 
 
8. Notified details: 
 
A: Voting rights attached to shares viii, ix 
Class/type of             Situation previous                          Resulting situation after 
shares                    to the triggering                          the triggering transaction 
                             transaction 
 
if possible 
using 
the ISIN CODE 
                      Number            Number         Number         Number of              % of voting 
                    of Shares          of Voting         of            voting                 rights x 
                                        Rights         shares          rights 
 
                                                       Direct    Direct    Indirect      Direct      Indirect 
                                                                   xi         xii 
 
GB00B39J2M42           N/A                N/A            N/A       N/A    34,674,396       N/A         5.09% 
 
 
 
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 xiv        rights that may be         rights 
                                                                          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 financial     Exercise   Expiration      Exercise/     Number of voting rights       % of voting 
      instrument         price      date xvii     Conversion       instrument refers to       rights xix, xx 
                                                 period xviii 
                                                                                              Nominal    Delta 
 
         CFD              N/A          N/A            N/A                811,065               0.12% 
 
Total (A+B+C) 
 
Number of voting rights                                    Percentage of voting rights 
 
35,485,461 
 
9. Chain of controlled undertakings through which the voting rights and/or the 
financial instruments are effectively held, if applicable: xxi 
 
On 1 December 2009, the Barclays Global Investors (BGI) business was acquired 
by BlackRock, Inc. The combined holdings of BlackRock, Inc. following this 
acquisition triggered this disclosure requirement. 
 
BlackRock Investment Management (UK) Limited - 35,485,461 (5.21%) 
 
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: 
 
 
                                     BlackRock Compliance Disclosures Team 
13. Additional information: 
 
14. Contact name:                    Stuart Watchorn 
 
15. Contact telephone number:        020 7743 5741; 
                                     stuart.watchorn@blackrock.com 
 
Note: Annex should only be submitted to the FSA not the issuer 
Annex: Notification of major interests in sharesxxii 
 
A: Identity of the persons or legal entity subject to the notification obligation 
 
Full name                                  BlackRock, Inc. 
(including legal form of legal entities) 
 
Contact address                            33 King William Street, London, EC4R 9AS 
(registered office for legal entities) 
 
Phone number & email                       020 7743 5741 stuart.watchorn@blackrock.com 
 
Other useful information                   Stuart Watchorn 
 
(at least legal representative for legal 
persons) 
 
B: Identity of the notifier, if applicable 
 
Full name 
 
Contact address 
 
Phone number & email 
 
Other useful information 
 
(e.g. functional relationship with the 
person or legal entity subject to the 
notification obligation) 
 
C: Additional information 
 
For notes on how to complete form TR-1 please see the FSA website. 
 
END 
 

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