Transaction in Own Shares

National Grid PLC
03 March 2008

National Grid plc - Transaction in Own Shares

3 March 2008

National Grid plc announces that on 29 February 2008 it purchased 1,040,394 of
its ordinary shares at a price of 735.6699 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 2,523,074,511 and the
number of ordinary shares in Treasury will be 58,839,005.

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