The leader of the campaign to keep Britain in the European Union has been accused of a “morally unacceptable” plot to use Jo Cox's death to make case for Remain and “call out” Brexit supporters

Will Straw, the executive director of Britain Stronger In Europe, also gave supporters details of a new closing argument for the final hours of the Referendum campaign to reflect the “new context that we’re in” in the wake of the murder of the Labour MP last week.

In a leaked private telephone conference call, Mr Straw said that “it is now time to make a very positive case for why we want to be in the European Union”.