To listen to some conservative commentary in London on Friday, you would think the British Prime Minister David Cameron just morphed into Winston Churchill, valiantly upholding England’s ancient liberties against German aggression. In fact, what happened in Europe this week was nothing so grandiose. David Cameron’s refusal to back a Franco-German plan to revise the European Union treaty was the culmination of a consistent Conservative policy, dating back to Margaret Thatcher and continued under John Major. That policy has been to resist any steps taken in the name of European integration that would in practice lead to Britain’s becoming a member of a federal Europe.