UK Stocks-Factors to watch on Oct. 20

Oct 20 (Reuters) - Britain's FTSE 100 index is seen opening flat in percentage terms on Thursday, according to financial bookmakers. * The UK blue chip index ended 0.3 percent higher at 7,021.92 points on Wednesday, with energy stocks tracking a sharp rally in crude oil prices and banks gaining momentum after U.S. bank Morgan Stanley reported better-than-expected profits. * RIO TINTO: Global miner Rio Tinto on Thursday cut its 2016 guidance for iron ore shipments by as much as 5