For a number of years there has been nothing at all unusual about the United Kingdom finding itself in a state of constitutional upheaval; indeed, for some time, this has been the UK constitution’s default setting. This has sometimes been as a result of long-anticipated and carefully planned reforms, such as the enactment, in the late 1990s, of legislation to give domestic effect to the European Convention on Human Rights and to introduce devolved systems of government in Scotland, Wales and Northern Ireland. In contrast, more recent upheaval is attributable to often unexpected reactions to often unexpected events. For example, legislation making substantial changes to the devolution scheme in Scotland – providing, among other things, for the constitutional permanence of the Scottish Parliament and Government – was enacted to implement panicked promises made by UK politicians in the dying days of the Scottish independence referendum campaign, at which point a vote in favour of independence seemed a distinct possibility. And then, needless to say, there is Brexit – about which it is almost impossible to be guilty of hyperbole when describing its constitutional implications, so numerous and potentially far-reaching are they.