Holding(s) in Company

Pennon Group PLC 07 November 2007 PENNON GROUP PLC FOR IMMEDIATE RELEASE HOLDING IN COMPANY NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached (ii): PENNON GROUP PLC 2. Reason for the notification An acquisition of voting rights 3. Full name of person(s) subject to the notification obligation Legal & General Group Plc (L&G) 4. Full name of shareholder(s) Legal & General Assurance (Pensions Management) Limited (PMC) 5. Date of the transaction (and date on which the threshold is crossed or reached if different) 17 October 2007 6. Date on which issuer notified: 6 November 2007 7. Threshold(s) that is/are crossed or reached: From 3% - 4% (L&G) 8. Notified details: A: Voting rights attached to shares Class/type of shares if possible Situation previous to the Triggering transaction using the ISIN CODE Number of shares Number of voting Rights ORD GBP 0.407 13,868,291 13,868,291 Resulting situation after the triggering transaction Class/type of shares if Number of shares Number of voting rights (ix) % of voting rights possible using the ISIN CODE Direct Direct (x) Indirect (xi) Direct Indirect ORD GBP 0.407 14,230,269 14,230,269 4.07% B: Financial Instruments Resulting situation after the triggering transaction Type of Expiration Date Exercise/Conversion Number of voting rights % of voting rights financial (xiii) Period/ Date that may be acquired if the instrument instrument is exercised/ converted. Total (A+B) Number of voting rights % of voting rights 14,230,269 4.07% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable Legal & General Group Plc (Direct and Indirect) (Group) Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect) Legal & General Investment Management Limited (Indirect) (LGIM) Legal & General Group Plc (Direct) (L&G) (14,230,269 - 4.07% = LGAS, LGPL & PMC) Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD) (12,549,057 - 3.59% = PMC) Legal & General Insurance Holdings Limited (Direct) (LGIH) Legal & General Assurance (Pensions Management) Limited Legal & General Assurance Society Limited (PMC) (12,549,057 - 3.59% = PMC) (LGAS & LGPL) Legal & General Pensions Limited (Direct) (LGPL) Proxy Voting: 10. Name of the proxy holder: N/A 11. Number of voting rights proxy holder will cease to hold: N/A 12. Date on which proxy holder will cease to hold voting rights: N/A 13. Additional information: Notification using the total voting rights figure of 349,098,262. Please note that this notification has been delayed due to the large number of disclosures required following a substantial amount of new business which has come to Legal & General Group Plc in the form of an in-specie transfer. Annex to Notification of Major Interests In Shares A: Identity of the person or legal entity subject to the notification obligation Full name (including legal form for legal entities): Pennon Group Plc Contact address (registered office for legal entities): Peninsula House, Rydon Lane, Exeter, Devon, EX2 7HR Contact name Christopher Paul Richards - Interim Assistant Company Secretary Phone number 01392 443060 7 November 2007 www.pennon-group.co.uk End transmission This information is provided by RNS The company news service from the London Stock Exchange

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