What is the opposition’s policy on Brexit, by far the biggest policy question facing the country? Could anyone sum it up in a sentence or two? Do they back leaving the EU or not? Are they for ending free movement and leaving the single market? With fewer than 100 days to go, it’s getting rather late in the day for their position to still be so nebulous, as President Juncker might say, on such an important issue.

For many months now the shadow Brexit secretary Sir Keir Starmer has been manoeuvring Labour towards a position where it could back a second referendum, with Remain on the ballot paper. At the Labour conference in September, a motion was passed explicitly putting such an option on the