Transaction in Own Shares

National Grid PLC
12 October 2007

National Grid plc - Transaction in Own Shares



12 October 2007



National Grid plc announces that on 11 October 2007 it purchased for
cancellation 473,893 of its ordinary shares at a price of 772.1937 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
2,591,320,828 and the number of ordinary shares in Treasury will be 13,171,056.





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