Volnteering to give up his right to call an election at a time of his choosing which, of course, would not need any legislation is one thing. To change the constitution so that a 55% vote against the government is required to force an election is an entirely different matter. It was not in a manifesto and should be subject to a referendum in my opinion. Should a situation arise in which a vote of no cofidence was carried with less than 55%, it is highly likely that the government would then be prevented from enacting anything. Typical Eton Mess.