Transaction in Own Shares

National Grid PLC
07 November 2007

National Grid plc - Transaction in Own Shares

7 November 2007

National Grid plc announces that on 6 November 2007 it purchased for
cancellation 1,040,000 of its ordinary shares at a price of 789.4284 pence per
share from Morgan Stanley Securities Limited.

Following the purchase and upon cancellation of these shares, the number of
ordinary shares with voting rights in issue (excluding Treasury shares) will be
2,575,762,256 and the number of ordinary shares in Treasury will be 13,106,561.

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