Transaction in Own Shares

National Grid PLC
20 September 2007

National Grid plc - Transaction in Own Shares


20 September 2007


National Grid plc announces that on 19 September 2007 it purchased for
cancellation 887,655 of its ordinary shares at a price of 775.7375 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
2,599,727,983 and the number of ordinary shares in Treasury will be 13,601,486.





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