LONDON (Dow Jones)--National Grid PLC (NG.LN), a U.K. utility company, said Wednesday it has repurchased GBP10,816,000 of the GBP223,194,000 5.25% instruments due June 2011, for cancellation. MAIN FACTS: -Following the repurchase the amount of securities outstanding is GBP212,378,000. -Shares closed Wednesday at 491 pence. -By Tommy Stubbington, Dow Jones Newswires; 44-20-7842-9268; [email protected] (END) Dow Jones Newswires June 30, 2010 13:22 ET (17:22 GMT)