Blocklisting Interim Review

Pennon Group PLC
30 January 2008

                        BLOCK LISTING SIX MONTHLY RETURN



Information provided on this form must be typed or printed electronically and
provided to an ris.



Date:               30 January 2008


Name of applicant:                                         PENNON GROUP PLC

Name of scheme:                                            PENNON GROUP SHARESAVE SCHEME

Period of return:                           From:          29/07/07               To:        28/01/08

Balance of unallotted securities under scheme(s) from      354,465
previous return:

Plus:  The amount by which the block scheme(s) has been    N/A
increased since the date of the last return (if any
increase has been applied for):

Less:  Number of securities issued/allotted under scheme   815,100 - Allocated from shares held in Treasury
(s) during period (see LR3.5.7G):

Equals:  Balance under scheme(s) not yet issued/allotted   354,465
at end of period:


Name of contact:                                           C P Richards - Interim Assistant Company Secretary

Telephone number of contact:                               01392 443060





30 January 2008



www.pennon-group.co.uk



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