Transaction in Own Shares

National Grid PLC
21 April 2008


National Grid plc - Transaction in Own Shares

21 April 2008

National Grid plc announces that on 18 April 2008 it purchased 660,000 of its
ordinary shares at a price of 713.50 pence per share from Deutsche Bank AG
London Branch. 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 2,506,610,687 and the
number of ordinary shares in Treasury will be 75,302,829.

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