Blocklisting Interim Review

Pennon Group PLC
24 October 2005

                        BLOCK LISTING SIX MONTHLY RETURN

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

To:  The FSA

Date: 24 October 2005

Name of applicant:                                         PENNON GROUP PLC

Name of scheme:                                            PENNON GROUP SHARESAVE SCHEME

Period of return:                           From:          24/03/05               To:        23/09/05

Balance under scheme from previous return:                 145,531

The amount by which the block scheme has been increased,   518,116
if the scheme has been increased since the date of the
last return:

Number of securities issued/allotted under scheme during   509,183
period:

Balance under scheme not yet issued/allotted at end of     154,464
period

Number and class of securities originally listed and the   157,657,600 ORDINARY SHARES OF 111P EACH ON 02/09/02
date of admission

Total number of securities in issue at the end of the      128,453,523
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.


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