Transaction in Own Shares

National Grid PLC
29 January 2008



National Grid plc - Transaction in Own Shares

29 January 2008


National Grid plc announces that on 28 January 2008 it purchased 395,066 of its
ordinary shares at a price of 772.1983 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 2,534,914,573 and the
number of ordinary shares in Treasury will be 46,998,943.



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