National Grid plc - Transaction in Own Shares

15 May 2008

National Grid plc announces that on 14 May 2008 it purchased 250,000 of its ordinary shares at a price of 714.96 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 2,499,111,287and the number of ordinary shares in Treasury will be 82,802,229.

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