Transaction in Own Shares

National Grid PLC
19 October 2007

National Grid plc - Transaction in Own Shares



19 October 2007



National Grid plc announces that on 18 October 2007 it purchased for
cancellation 1,290,000 of its ordinary shares at a price of 785.8052 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
2,586,821,709 and the number of ordinary shares in Treasury will be 13,133,370.





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