Contrary to claims of Britain’s enduring political and constitutional distinctiveness, in the period from 1997 to 2016 the UK in fact modernised its polity by following several strong ‘Europeanisation’ trends. British democracy came to increasingly resemble other European liberal democracies in some fundamental ways. Yet now this meta-narrative may be lost following Brexit. Patrick Dunleavy explores some implications of the UK’s possible lapse back into rudderless idiosyncrasy.