Transaction in Own Shares

National Grid PLC
18 October 2007



National Grid plc - Transaction in Own Shares

18 October 2007


National Grid plc announces that on 17 October 2007 it purchased for
cancellation 680,000 of its ordinary shares at a price of 783.9404 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
2,588,111,709 and the number of ordinary shares in Treasury will be 13,133,370.





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