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