Rule 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 Name of person dealing (Note 1) Newton Investment Management Limited & its subsidiaries Company dealt in Centrica PLC Class of relevant security to which the Ordinary GBP0.061728395 dealings being disclosed relate (Note 2) Date of dealing 13/10/08 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) Centrica PLC Long Short Number (%) Number (%) (1) Relevant securities 92,135,292 2.48 (2) Derivatives (other than options) (3) Options and agreements to purchase/sell Total 92,135,292 2.48 (b) Interests and short positions in relevant securities of the company, other than the class dealt in (Note 3) Class of relevant security: Long Short Number (%) Number (%) (1) Relevant securities (2) Derivatives (other than options) (3) Options and agreements to purchase/sell Total (c) Rights to subscribe (Note 3) Class of relevant security: Details 3. DEALINGS (Note 4) (a) Purchases and sales Purchase/sale Number of securities Price per unit (Note 5) Purchase of 864,227 £2.765211 Purchase of 69,000 £2.725 Purchase of 17,289 £2.7575 Sale of 5,225 £2.756579 Sale of 900 £2.775 (b) Derivatives transactions (other than options) Product name, Long/short (Note Number of securities Price per e.g. CFD 6) (Note 7) unit (Note 5) (c) Options transactions in respect of existing securities (i) Writing, selling, purchasing or varying Product Writing, Number of Exercise Type, Expiry Option name,e.g. selling, securities price e.g. date moneypaid/received call purchasing, to which American, per unit (Note 5) option varying the option European etc. relates etc. (Note 7) (ii) Exercising Product name, e.g. call Number of securities Exercise price per unit option (Note 5) (d) Other dealings (including new securities) (Note 4) Nature of transaction (Note Details Price per unit (if applicable) 8) (Note 5) 4. OTHER INFORMATION Agreements, arrangements or understandings relating to options or derivatives 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. None .......................... .......................... Is a Supplemental Form 8 attached? (Note 9) NO Date of disclosure 14th October 2008 Contact name Asif S Lalani Telephone number 020 7163 5115 If a connected EFM, name of offeree/offeror with which connected If a connected EFM, state nature of connection (Note 10) ---END OF MESSAGE--- This announcement is originally distributed by Hugin. The issuer is solely responsible for the content of this announcement.