Rule 8.3 - CENTRICA PLC

INVESCO Limited FORM 8.3 DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE (Rule 8.3 of the City Code on Takeovers and Mergers) 1. KEY INFORMATION -0- *T Name of person dealing (Note 1) INVESCO LIMITED ------------------------------------------ --------------------------------------------------------------- Company dealt in CENTRICA PLC ------------------------------------------ --------------------------------------------------------------- Class of relevant security to which the ORDINARY 6.17284p SHARES dealings being disclosed relate (Note 2) ------------------------------------------ --------------------------------------------------------------- Date of dealing 08 SEPTEMBER 2008 ------------------------------------------ --------------------------------------------------------------- *T 2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE (a) Interests and short positions (following dealing) in the class of relevant security dealt in (Note 3) -0- *T Long Short ---------------------------- ------------------------------------- ----------------------------------------- Number (%) Number (%) ---------------------------- ------------------ ------------------ ------------------- --------------------- (1) Relevant securities 137,890,757 (3.71%) ---------------------------- ------------------ ------------------ ------------------- --------------------- (2) Derivatives (other than options) ---------------------------- ------------------ ------------------ ------------------- --------------------- (3) Options and agreements to purchase/sell ---------------------------- ------------------ ------------------ ------------------- --------------------- Total 137,890,757 (3.71%) ---------------------------- ------------------ ------------------ ------------------- --------------------- *T (b) Interests and short positions in relevant securities of the company, other than the class dealt in (Note 3) -0- *T Class of relevant security: Long Short --------------------------------------------------------------------------------------------------------- Number (%)Number (%) --------------------------------------------------------------------------------------------------------- (1) Relevant securities --------------------------------------------------------------------------------------------------------- (2) Derivatives (other than options) --------------------------------------------------------------------------------------------------------- (3) Options and agreements to purchase/sell --------------------------------------------------------------------------------------------------------- Total --------------------------------------------------------------------------------------------------------- *T (c) Rights to subscribe (Note 3) -0- *T Class of relevant security: Details --------------------------------------------------------------------------------------------------------- *T 3. DEALINGS (Note 4) (a) Purchases and sales -0- *T Purchase/sale Number of securities Price per unit (Note 5) ----------------------------------- ---------------------------------- ------------------------------------ Purchase (ADR Ratio 10:1) 238 57.60 USD ----------------------------------- ---------------------------------- ------------------------------------ Purchase (ADR Ratio 10:1) 205 57.45 USD ----------------------------------- ---------------------------------- ------------------------------------ Purchase (ADR Ratio 10:1) 23 57.55 USD ----------------------------------- ---------------------------------- ------------------------------------ Purchase (ADR Ratio 10:1) 36 59.33 USD ----------------------------------- ---------------------------------- ------------------------------------ Purchase (ADR Ratio 10:1) 50 59.35 USD ----------------------------------- ---------------------------------- ------------------------------------ Sale (ADR Ratio 10:1) 410 56.99 USD ----------------------------------- ---------------------------------- ------------------------------------ Sale (ADR Ratio 10:1) 14 57.49 USD ----------------------------------- ---------------------------------- ------------------------------------ Sale (ADR Ratio 10:1) 33 57.24 USD ----------------------------------- ---------------------------------- ------------------------------------ Sale (ADR Ratio 10:1) 18 57.00 USD ----------------------------------- ---------------------------------- ------------------------------------ Sale (ADR Ratio 10:1) 25 57.14 USD ----------------------------------- ---------------------------------- ------------------------------------ *T (b) Derivatives transactions (other than options) -0- *T Product name, Long/short (Note 6) Number of securities (Note 7) Price per unit (Note 5) e.g. CFD -------------------------------------------------------------------------------------------------------- *T (c) Options transactions in respect of existing securities (i) Writing, selling, purchasing or varying -0- *T Product name, Writing, Number of Exercise Type, e.g. Expiry Option money e.g. call option selling, securities to price American, date paid/received purchasing, which the option European per unit (Note varying etc. relates (Note 7) etc. 5) ------------------------------------------------------------------------------------------------------- *T (ii) Exercising -0- *T Product name, e.g. call option Number of securities Exercise price per unit (Note 5) --------------------------------------------------------------------------------------------------------- *T (d) Other dealings (including new securities) (Note 4) -0- *T Nature of transaction (Note 8) Details Price per unit (if applicable) (Note 5) --------------------------------------------------------------------------------------------------------- *T 4. OTHER INFORMATION Agreements, arrangements or understandings relating to options or derivatives -0- *T Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated. --------------------------------------------------------------------------------------------------------- *T Is a Supplemental Form 8 attached? (Note 9) NO -0- *T Date of disclosure 09 SEPTEMBER 2008 ------------------------------------------------------------ --------------------------------------------- Contact name ON BEHALF OF INVESCO LIMITED ------------------------------------------------------------ --------------------------------------------- Telephone number 01491 417404 ------------------------------------------------------------ --------------------------------------------- If a connected EFM, name of offeree/offeror with which connected ------------------------------------------------------------ --------------------------------------------- If a connected EFM, state nature of connection (Note 10) ------------------------------------------------------------ --------------------------------------------- *T Notes The Notes on Form 8.3 can be viewed on the Takeover Panel's website at www.thetakeoverpanel.org.uk

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