Over the agitated British political landscape there now hovers menacingly the Law of Unintended Consequences. In normal times, whatever the scale of parliamentary upheaval, it was always possible to chart the future course of events with some degree of accuracy since the long-established rules of procedure imposed limits on the constitutionally sanctioned outcome.

But these are not normal times. In a House of Commons teeming with Remainers and presided over by a Speaker prepared to jettison long-established parliamentary conventions, anything can happen.