National Grid plc - Transaction in Own Shares

24 July 2008

National Grid plc announces that on 23 July 2008 it purchased 970,000 of its ordinary shares at a price of 689.18 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 2,466,266,670 and the number of ordinary shares in Treasury will be 115,646,846.

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