One in five of PM Cameron's MPs may favour 'Brexit' - lobby group

By Guy Faulconbridge and Kylie MacLellan LONDON (Reuters) - As many as one in five of British Prime Minister David Cameron's members of parliament is likely to vote to leave the European Union in a referendum, research showed on Friday, with the "Brexit" issue likely to dominate the party's annual conference next week. Cameron has promised to renegotiate Britain's EU ties ahead of a membership vote by the end of 2017. Splits over Europe have long plagued Cameron's party, contributing to the down