The chances of Britain leaving the EU rose dramatically last night after it emerged that one of David Cameron’s closest Cabinet allies believes it is time to tell Brussels bluntly: “We are ready to quit.” Education Secretary Michael Gove has told friends that, if there was a referendum today on whether the UK should cut its ties with Brussels, he would vote to leave. He wants Britain to give other EU nations an ultimatum: “Give us back our sovereignty or we will walk out.” …