Transaction in Own Shares

National Grid PLC
02 October 2007

National Grid plc - Transaction in Own Shares

2 October 2007


National Grid plc announces that on 1 October 2007 it purchased for cancellation
614,631 of its ordinary shares at a price of 785.6097 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
2,597,965,458 and the number of ordinary shares in Treasury will be 13,597,636.





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