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 20 December 2006 that:

(1) The following Directors and other Persons Discharging Managerial
Responsibility for the Company acquired Shares under the SIP on 19 December 2006
held through the Trustee:

-0-
*T
                                Number                   Aggregate Shares held
                                of Shares                Beneficially (across all accounts
Directors                       Acquired*                following acquisition)
Phil Bentley                    52                       460,880
Sam Laidlaw                     52                       200,106
Jake Ulrich                     54                       719,341

Persons Discharging Managerial
 Responsibility
Grant Dawson                    54                       219,515
Anne Minto                      54                       115,926
Chris Weston                    54                       75,840
*T

* The 'Number of Shares Acquired' includes 36 Partnership shares (Phil Bentley
and Sam Laidlaw received 35 partnership shares each due to slightly lower cash
balances) acquired at 353.25 pence per share and 18 Matching shares (Phil
Bentley and Sam Laidlaw received 17 Matching shares each) acquired at 343.00
pence per share. Both Partnership and Matching elements are registered in the
name of the Trustee.

(2) They had transferred 11,765 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 December's allocation of Matching shares. The
Directors listed above, together with some 5,461 other employees, are
participants in the Plan and are potentially interested in the remaining 326
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.