Today’s no-confidence vote in Boris Johnson is best seen as the next stage of a determined long-term plot to bring him down rather than as a stand-alone event. That is to say, Johnson will not be safe or restored to anything like full political health simply by winning it. Unless he triumphs by a crushing margin, he will have been further weakened and face new waves of attacks from a Labour opposition into whose lap huge amounts of extra ammunition will have been deposited by Conservative backbenchers.