
Whenever something cataclysmic happens in politics, there’s a temptation to trace it back to a single moment that set everything in motion: the shot heard around the world. Or, in the case of the night in the Commons bar where Eric Joyce lamped a fellow MP, prompting a fishy by-election in Falkirk that led to a fundamental reform of the Labour party rules, which enabled the election of Jeremy Corbyn, the punch that changed politics.
You can’t always identify the flap of the butterfly’s wings that creates a hurricane. The EU referendum result was driven by many factors: class, geography, differential turnout, culture and education. Even the broad conclusions – more older voters turned out and they were heavily pro-Brexit; cities went for Remain – must be qualified: why was Liverpool a win for Remain while Sunderland picked Leave?