Blocklisting Interim Review

Pennon Group PLC
31 July 2007

                        BLOCK LISTING SIX MONTHLY RETURN

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

To:  The FSA

Date: 31 July 2007

Name of applicant:                                         PENNON GROUP PLC
Name of scheme:                                            PENNON GROUP SHARESAVE SCHEME
Period of return:                           From:          29/01/2007             To:        28/07/07
Balance under scheme from previous return:                 389,006
The amount by which the block scheme has been increased,   N/A
if the scheme has been increased since the date of the
last return:
Number of securities issued/allotted under scheme during   35,802
period:
Balance under scheme not yet issued/allotted at end of     354,465
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      353,530,589
period


Name of contact:                                           C P RICHARDS
Address of contact:                                        PENINSULA HOUSE, RYDON LANE,
                                                           EXETER, DEVON EX2 7HR
Telephone number of contact:                               01392 443060

SIGNED BY   C P RICHARDS  - INTERIM 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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