Blocklisting - Interim Review

BLOCK LISTING SIX MONTHLY RETURN Information provided on this form must be typed or printed electronically andprovided to an ris.Date: 31 January 2013Name of applicant: UNITED UTILITIES GROUP PLC Name of schemes: United Utilities Group 2008 Savings related share Option Scheme, United Utilities Group 2008 Performance Share Plan, United Utilities Group 2008 Matching Share Award Plan, United Utilities PLC Approved Share Option Plan 1999, United Utilities PLC Unapproved Share Option Plan 1999 and United Utilities Executive Share Option Scheme. Period of return: From: 01/08/2012 To: 31/01/2013 Balance of unallotted securities under 9,496,363 scheme(s) from previous return: Plus: The amount by which the block NIL scheme(s) has been increased since the date of the last return (if any increase has been applied for): Less: Number of securities issued/ 3,548 allotted under scheme(s) during period (see LR3.5.7G): Equals: Balance under scheme(s) not 9,492,815 yet issued/allotted at end of period: Name of contact: Jane Gilmore Telephone number of contact: 01925 237052