Battle lines drawn as Britain squares up for EU vote

Campaigning in Britain's Brexit referendum officially begins on Friday, ten weeks ahead of a vote that will hand Britons their first chance to have their say on Europe since 1975. With opinion polls suggesting the British public are deeply divided on whether to stay in the EU, the Leave campaign's biggest name -- charismatic London mayor Boris Johnson -- will lead its "Brexit blitz" with rallies on Friday and Saturday in three northern cities. In the "Remain" corner is Prime Minister David Camer