Transaction in Own Shares

National Grid PLC
29 November 2007


National Grid plc - Transaction in Own Shares


29 November 2007


National Grid plc announces that on 28 November 2007 it purchased 690,000 of its
ordinary shares at a price of 802.7577 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 2,560,928,349 and the
number of ordinary shares in Treasury will be 20,985,167.



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