The British referendum on whether to stay in, or leave, the European Union may well be held this coming summer. It will be a vote of momentous significance for Britain and for the EU. The polls suggest it could be a close run thing. Stephen Sackur talks to Lord Lawson, president of the Conservatives for Britain group, which is campaigning for a British exit in defiance of Prime Minister David Cameron and his Conservative Government’s official strategy. The Eurosceptic’s have a historic opportunity – can they seize it?(Photo: Lord Lawson on Hardtalk)