Holding(s) in Company

Centrica PLC
                  

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TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES
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1. Identity of the issuer or the underlying issuer
of existing shares to which voting rights are                                                      Centrica plc
attached:
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2 Reason for the notification (please tick the appropriate box or boxes):
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An acquisition or disposal of voting rights                                                           X
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An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issues to which voting rights are attached
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An event changing the breakdown of voting rights
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Other (please
 specify):
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3. Full name of person(s) subject to the            AXA S.A., 25 Avenue Matignon, 75008 Paris and its group of
notification obligation:                                                                              companies
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4. Full name of shareholder(s) (if different
from 3.):                                                                                                  N/A
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5. Date of the transaction and date on
which the threshold is crossed or                                                                 18 March 2007
reached:
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6. Date on which issuer notified:                                                                 22 March 2007
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7. Threshold(s) that is/are crossed or
reached:                                                                                                     5%
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8. Notified details:
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A: Voting rights attached to shares
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Class/type of      Situation previous        Resulting situation after the triggering transaction
shares             to the Triggering
                   transaction
if possible using  ------------------------- ------------------------------------------------------------------
the ISIN CODE      Number       Number       Number       Number of voting             % of voting rights
                   of           of           of shares    rights
                   Shares       Voting       ------------ ---------------------------- ------------------------
                                Rights       Direct       Direct    Indirect           Direct      Indirect
------------------------------- ------------ ------------ ---------------------------- ----------- ------------
Ordinary 6 14/81p

GB00B033F229       182,926,972  182,926,972  80,515,238   80,515,238   103,094,482     2.20        2.81
------------------------------- ------------ ------------ ------------ --------------- ----------- ------------


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B: Financial Instruments
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Resulting situation after the triggering transaction
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Type of financial         Expiration Exercise/ Conversion    Number of voting          % of voting
instrument                date        Period/ Date           rights that may be        rights
                                                             acquired if the
                                                             instrument is
                                                             exercised/ converted.
-------------------------------------------------------------------------------------- ------------------------
N/A                       N/A        N/A                     N/A                       N/A
-------------------------------------------------------------------------------------- ------------------------


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Total (A+B)
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Number of voting rights                              % of voting rights
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183,609,720                                          5.01%
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9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:
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AXA Ireland Pension Fund - Indirect                                                                     38,000
AXA Sun Life plc - Direct                                                                            7,858,014
AXA Rosenberg - Direct                                                                               2,545,299
AXA General Insurance Ltd - Direct - Direct                                                             44,978
Sun Life Unit Assurance Ltd A/c X - Direct                                                          11,502,000
Sun Life Unit Assurance Ltd A/c X - Direct                                                          22,842,486
AXA UK Investment Co ICVC Global Distribution Fund - Indirect                                           21,640
AXA UK Investment Co ICVC Global Growth Fund - Indirect                                                  4,000
AXA UK Investment Co ICVC Distribution Fund - Indirect                                                 750,000
PPP Healthcare Group plc - Indirect                                                                    254,793
Sun Life Pensions Management Ltd - Direct                                                              946,661
Sun Life Pensions Management Ltd A/c - Direct                                                        1,800,000
Sun Life Assurance Society Plc - Direct                                                              5,474,247
AXA Rosenburg - Direct                                                                               2,056,701
AXA Insurance UK - Direct                                                                            1,085,000
AXA UK Group Pension Scheme - Indirect                                                               1,200,000
AXA Financial, Inc - Indirect                                                                       81,281,240
AXA Colonia Konzern - Direct                                                                           152,000
Sun Life International (IOM) Ltd - Direct                                                            2,000,000
AXA France - Indirect                                                                                1,013,406
AXA Australia - Indirect                                                                               174,439
AXA Rosenburg - Indirect                                                                            16,650,828
AXA Financial, Inc* - Indirect                                                                         421,780
Sun Life Pensions Management Ltd - Direct                                                              442,915
Sun Life Pensions Management Ltd - Direct                                                               69,950
Sun Life Unit Assurance Ltd LTAV UK Equity - Direct                                                    921,016
Sun Life Unit Assurance Ltd ABL High Alpha - Direct                                                    373,200
Sun Life Unit Assurance Ltd FTSE All Share Tracker - Direct                                            683,077
Sun Life Pensions Management LTAV UK Equity - Direct                                                 4,175,322
Sun Life Pensions Management ABL High Alpha - Direct                                                 1,799,900
Sun Life Pensions Management FTSE ALL Share Tracker - Direct                                         3,228,770
AXA Framlington St James Place Exempt (Pens) Fund - Indirect                                           536,000
AXA St James Place Net (Life) Fund - Indirect                                                          599,000
AXA Framlington St James Place Offshore Fund - Indirect                                                140,000
Framlington onshore private clients - Indirect                                                           9,356
AXA Winterthur - Direct                                                                             10,513,702
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Proxy Voting:
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10. Name of the proxy holder:                                                                              N/A
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11. Number of voting rights proxy holder will cease
to hold:                                                                                                   N/A
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12. Date on which proxy holder will cease to hold
voting rights:                                                                                             N/A
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 13. Additional information:                                                                               N/A
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14. Contact name:                                                                                   Robin Healy
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15. Contact telephone number:                                                                    01753 494 017
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