Transaction in Own Shares

National Grid PLC
15 November 2007


National Grid plc - Transaction in Own Shares


15 November 2007


National Grid plc announces that on 14 November 2007 it purchased for
cancellation 1,309,557 of its ordinary shares at a price of 780.1459 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
2,568,833,213 and the number of ordinary shares in Treasury will be 13,080,303.


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