Britain's rival EU campaigns restart as polls show momentum for 'In'

By William James LONDON (Reuters) - The campaign to decide Britain's membership of the European Union restarted on Sunday after a three-day hiatus following the killing of lawmaker Jo Cox, with Prime Minister David Cameron warning that Britons faced an "existential choice" on Thursday. Campaigning activities ahead of the June 23 EU referendum resumed as two opinion polls showed the 'Remain' camp recovering some momentum, although the overall picture remains one of an evenly split electorate. "So