Since 2014, when the Festival coincided with the final run-up to the Scottish Independence referendum, making plays a part of the campaign, politics has become a special subject at Edinburgh.

A Westminster cataclysm in each subsequent summer – two unexpected general election results divided by the equally surprising EU referendum – should have continued this trend, but, because the deadline for the Fringe programme is early spring, pre-planned political productions risk being trumped by current affairs.