(REUTERS)  Campaigning for Britain’s vote on EU membership resumed on Sunday after a three-day hiatus prompted by the killing of a pro-EU lawmaker, but pledges of a more respectful tone were quickly tested by a fresh row over immigration. Three opinion polls ahead of Thursday’s vote showed the ‘Remain’ camp recovering some momentum, although the overall picture remained one of an evenly split electorate. The killing of Jo Cox, a 41-year-old mother of two young […]