Transaction in Own Shares

National Grid PLC
09 May 2008


National Grid plc - Transaction in Own Shares

9 May 2008

National Grid plc announces that on 8 May 2008 it purchased 330,000 of its
ordinary shares at a price of 703.67 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 2,500,294,911 and the
number of ordinary shares in Treasury will be 81,618,605.

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