Holding(s) in Company

Centrica PLC TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: Centrica plc 2. Reason for the notification: An acquisition or disposal of voting rights: No An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: No An event changing the breakdown of voting rights: No Other (please specify): Confirmation of Holding 3. Full name of person(s) subject to the notification obligation: AMVESCAP plc 4. Full name of shareholder(s) (if different from 3.): 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 6. Date on which issuer notified: 23 February 2007 7. Threshold(s) that is/are crossed or reached: 5% 8. Notified details: A: Voting rights attached to shares Situation previous to the triggering transaction -0- *T Class/type of shares Number of shares Number of voting Rights ----------------------------- ------------------------ ----------------------------- Ordinary/ 6 14/81 pence GB00B033F229 201,416,599 201,416,599 *T Resulting situation after the triggering transaction (vii) -0- *T Number of voting rights % of voting rights ------------------------------ ----------------------- Class/type of shares Number of shares Direct Indirect Direct Indirect ---------------------------- ------------------- ------------- ---------------- ---------- ------------ Ordinary/ 6 14/81 pence GB00B033F229 201,416,599 N/A 201,416,599 N/A 5.498% *T B: Financial Instruments Resulting situation after the triggering transaction -0- *T Type of Expiration Date Exercise/Conversion Number of voting rights % of voting rights financial Period/ Date that may be acquired if instrument the instrument is exercised/ converted. -------------- ------------------- ---------------------- ------------------------ ------------------ N/A N/A N/A N/A N/A *T Total (A+B) -0- *T Number of voting rights % of voting rights ------------------------ ---------------------- 201,416,599 5.498% *T 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable : -0- *T Bank of Ireland (Dublin) 2,759,166 ------------------------------------------------ ------------------- Bank of New York 213,145 ------------------------------------------------ ------------------- Banque Paribas 1,285,448 ------------------------------------------------ ------------------- Bank of New York (Brussels) 108,921 ------------------------------------------------ ------------------- Bank of New York (Singapore) 61,000 ------------------------------------------------ ------------------- Chase Bank 250,281 ------------------------------------------------ ------------------- Chase Nominees 5,049,439 ------------------------------------------------ ------------------- Vidacos Nominees 160,536,486 ------------------------------------------------ ------------------- Erst Bank (Vienna) 8,816 ------------------------------------------------ ------------------- HSBC Nominees 3,331,296 ------------------------------------------------ ------------------- Japan Trustee Services Bank 4,259 ------------------------------------------------ ------------------- Mellon Bank (New York) 1,654,142 ------------------------------------------------ ------------------- Santander Central Hispano Investment 43,002 ------------------------------------------------ ------------------- UFJ Trust Bank 10,000 ------------------------------------------------ ------------------- State Street Trust & Banking Co 23,255,214 ------------------------------------------------ ------------------- Trust & Custody Services 10,663 ------------------------------------------------ ------------------- Northern Trust Company (London) 2,835,321 ------------------------------------------------ ------------------- *T 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: N/A 14. Contact name: Robin Healy 15. Contact telephone number: 01753 494 017

Companies

Centrica (CNA)
UK 100

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