Blocklisting Interim Review

Pennon Group PLC
31 January 2007


                        BLOCK LISTING SIX MONTHLY RETURN


Information provided on this form must be typed or printed electronically.


To:    The FSA

Date:  31 January 2007

Name of applicant:                                         PENNON GROUP PLC

Name of scheme:                                            PENNON GROUP SHARESAVE SCHEME

Period of return:                           From:          29/07/06               To:        28/01/07

Balance under scheme from previous return:                 349,665

The amount by which the block scheme has been increased,   1,087,533
if the scheme has been increased since the date of the
last return:

Number of securities issued/allotted under scheme during   1,048,192
period:

Balance under scheme not yet issued/allotted at end of     389,006
period

Number and class of securities originally listed and the   355,441,206 ORDINARY SHARES OF 40.7P EACH ON 31/07/06
date of admission

Total number of securities in issue at the end of the      356,089,733
period


Name of contact:                                           M L HEELEY

Address of contact:                                        PENINSULA HOUSE, RYDON LANE,

                                                           EXETER, DEVON EX2 7HR

Telephone number of contact:                               01392 443060


SIGNED BY   M L HEELEY - ASSISTANT COMPANY SECRETARY
            for and on behalf of
            PENNON GROUP PLC


If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.


www.pennon-group.co.uk


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