Transaction in Own Shares

National Grid PLC
11 February 2008



National Grid plc - Transaction in Own Shares

11 February 2008


National Grid plc announces that on 8 February 2008 it purchased 249,761 of its
ordinary shares at a price of 771.8719 pence per share from Morgan Stanley
Securities Limited. The purchased shares will be held as Treasury shares.

Following the purchase of these shares, the number of ordinary shares with
voting rights in issue (excluding Treasury shares) will be 2,531,500,367 and the
number of ordinary shares in Treasury will be 50,413,149.





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