National Grid plc - Transaction in Own Shares

13 May 2008

National Grid plc announces that on 12 May 2008 it purchased 300,000 of its ordinary shares at a price of 712.37 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 2,499,744,911 and the number of ordinary shares in Treasury will be 82,168,605.

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