UK Stocks-Factors to watch on May 7

Britain's FTSE 100 index is seen opening 19 points lower at 7,361 on Tuesday, according to financial bookmakers. * VECTURA: British drugmaker Vectura Group Plc said on Saturday that it won a patent infringement litigation case against GlaxoSmithKline Plc in the United States and has been awarded $89.7 million in damages for the period from August 2016 through December 2018. * WHITBREAD: Elliott Advisors has become increasingly frustrated with Whitbread Plc's st