Michael Murray: A healthy scepticism about polls and selective tweaking of portfolios will have served investors well last week

But being prepared for a Brexit U-turn might serve them much more splendidly

Nigel Farage, the global face of the Brexit campaign, had given Sky what sounded like a concession. Pic: Getty

A large swathe of the British underclass has never perceived much practical difference over the past 25 years between Labour governments under Blair and Brown on the one hand, and Conservative governments under Major and Cameron on the other. The turnout from this “dispossessed” segment of the electorate has typically been low therefore.

But in the Leave or Remain referendum, the turnout of these underprivileged people was above the average, especially on council ...