Transaction in Own Shares

National Grid PLC
16 October 2007

National Grid plc - Transaction in Own Shares

16 October 2007

National Grid plc announces that on 15 October 2007 it purchased for
cancellation 786,805 of its ordinary shares at a price of 777.1620 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
2,589,584,023 and the number of ordinary shares in Treasury will be 13,171,056.



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