Imagine, for a moment, the following scenario. In 2016 Britain votes narrowly to remain within the European Union, despite the Prime Minister having achieved little in attempting to renegotiate the terms of our membership. The ‘out’ campaign — which was no longer led by a marginal party, Ukip, but by the majority of the parliamentary Labour party, under its new leader Jeremy Corbyn — came mightily close to securing our withdrawal, and thus, as it is put by proponents, our independence.