Holding(s) in Company

Pennon Group PLC
28 January 2008


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 or disposal 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)



23 January 2008



6. Date on which issuer notified:



24 January 2008



7. Threshold(s) that is/are crossed or reached:



From 4% - 5% (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                     16,743,368                               16,743,368




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               17,656,811               17,656,811                        5.06%



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

17,656,811                     5.06%



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)
(20,139,820 - 5.77% = Total Position)



Legal & General Investment Management (Holdings) Limited
(LGIMH) (Direct and Indirect) (20,139,820 - 5.77% = Total
Position)


Legal & General Investment Management Limited (Indirect)
(LGIM) (20,139,820 - 5.77% = Total Position)


Legal & General Group Plc (Direct) (L&G) (17,656,811 - 5.06% = LGAS, LGPL & PMC)


Legal & General Investment Management (Holdings) Limited
(Direct) (LGIMHD) (13,318,713 - 3.81%  = PMC)
                                                               Legal & General Insurance Holdings
                                                               Limited (Direct) (LGIH)

Legal & General Assurance (Pensions Management) Limited  (PMC) Legal & General Assurance Society
(13,318,713 - 3.81% = PMC)                                     Limited  (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 348,701,727.

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



28 January 2008



www.pennon-group.co.uk



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