UK stocks decreased following the announcement that Standard & Poor's Rating Services may downgrade the ratings in 15 euro-zone countries. The FTSE 100 lost 0.2% in the morning trade. Mining and energy stocks are top-losers, Vendanta Resources PLC declined by 2.3% while Eurasian Natural Resources Corp. PLC tumbled by 1.8%. Energy companies also experienced losses with Essar Energy PLC decreasing by 2.6%.