To leave or not to leave - that is the question - facing millions of voters in Britain and in the north on June 23 rd when they decide whether to stay in or leave the EU. The referendum on EU membership was proposed just over three years ago by the British Prime Minister, David Cameron. He had warned that unprecedented levels of immigration were: ‘ undermining support for the European Union’ within Britain. And for the Tories there were issues around welfare payments to immigrants, closer EU co-operation and increasing political union among EU states. It was and is a high risk strategy for Cameron given the deep divisions around Europe than lie within his own party. At least six Cabinet members, including the Secretary of State for the north, Theresa Villiers, are now part of the ‘leave’ campaign. And Boris Johnson, the Mayor of London and a rival for leadership of the Conservative party, has become the effective leader of the leave campaign. Several months ag...