Transaction in Own Shares

National Grid PLC
10 March 2008

National Grid plc - Transaction in Own Shares



10 March 2008



National Grid plc announces that on 7 March 2008 it purchased 807,469 of its
ordinary shares at a price of 719.8401 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 2,520,716,529 and the
number of ordinary shares in Treasury will be 61,196,987.





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