Transaction in Own Shares

National Grid PLC
07 January 2008


National Grid plc - Transaction in Own Shares

7 January 2008


National Grid plc announces that on 4 January 2008 it purchased 512,984 of its
ordinary shares at a price of 840.0856 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 2,547,847,551 and the
number of ordinary shares in Treasury will be 34,065,965.





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