Transaction in Own Shares

National Grid PLC
23 October 2007


National Grid plc - Transaction in Own Shares


23 October 2007


National Grid plc announces that on 22 October 2007 it purchased for
cancellation 990,000 of its ordinary shares at a price of 778.5108 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
2,584,741,709 and the number of ordinary shares in Treasury will be 13,133,370.


End


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