Director/PDMR Shareholding

Centrica PLC
                  Purchase of ordinary shares of 6 14/81 pence in Centrica plc ('Shares' and the
'Company', respectively) by Directors of the Company under its Share Incentive
Plan ('SIP').

The SIP trustee, Hill Samuel ESOP Trustees Limited (the 'Trustee'), notified the
Company on 22 May 2007 that:

(1) The following Directors and other Persons Discharging Managerial
Responsibility for the Company acquired Shares under the SIP on 21 May 2007 held
through the Trustee:

-0-
*T
                                 Number                    Aggregate Shares held
                                 of Shares                 Beneficially (across all accounts
Directors                        Acquired*                 following acquisition)
Phil Bentley                     46                        601,273
Sam Laidlaw                      48                        266,600
Jake Ulrich                      46                        860,745

Persons Discharging Managerial
 Responsibility
Grant Dawson                     46                        277,473
Catherine May                    46                        5,844
Anne Minto                       46                        195,231
Chris Weston                     46                        133,594
*T

* The 'Number of Shares Acquired' includes 31 Partnership shares (32 for Sam
Laidlaw due to a higher residual balance) acquired at 398.00 pence per share and
15 Matching shares (16 for Sam Laidlaw) acquired at 395.33 pence per share. Both
Partnership and Matching elements are registered in the name of the Trustee.

(2) They had transferred 9,730 ordinary shares of 6 14/81 pence each from Lloyds
TSB Registrars Corporate Nominee Limited AESOP1 (Allocated shares) to Lloyds TSB
Registrars Corporate Nominee Limited AESOP2 (Unallocated shares). The transfer
was made following the forfeiture of shares, under the rules of the SIP, by
participants who have left the group since the last purchase and the shares had
been used towards May's allocation of Matching shares. The Directors listed
above, together with some 5,479 other employees, are participants in the SIP and
are potentially interested in the remaining 354 shares held by Lloyds TSB
Registrars Corporate Nominee Limited AESOP2 left following the purchase.

The SIP operates as follows

    --  Each month the Trustee uses participants' contributions (which may not
        exceed £125 per participant per month) to purchase shares in the market.
        These shares are called 'Partnership Shares'.

    --  At the same time the Company allots to participants via the Trustee one
        'Matching Share' for every two partnership shares purchased that month
        (up to a maximum of 20 matching shares per month).

    --  Participants may change their monthly savings rate whenever they wish.
        However, Directors and others bound by the Company's Securities Dealing
        Code (the 'Code') may not make such a change during a close period or
        when otherwise prohibited from dealing by the Code.