The bomb in the living room

During the last parliament William Hague likened the issue of Europe to an unexploded bomb at the heart of the Conservative party — best leave it alone, or it might well detonate. But it still dominates British foreign policy. However far David Cameron has travelled in search of a different world — paying tribute to Nelson Mandela in South Africa or inspecting melting glaciers in Norway — he would always return to find this huge relic from a previous war sat in the middle of the Tory living room.