So Corbyn has restated that it is Labour policy to continue with Brexit. There is no change here since the referendum and the last party conference but I think there is a far amount of cynical calculation here. All parties have multiple policies - Brexit, yes, but also housing, education, NHS, and so on. I suspect that the calculation is that Labour Remainers have nowhere else to go, and the stance on those other issues will keep them voting Labour. On the other hand if Labour backed Remain, an unknown number would switch to Conservative. And of course it is true that the EU rules on state investment are an obstacle to Corbyn's investment plans. But left wing unicorns are just as I.aginary as right wing ones, I fear.

It is a policy that could very easily come unstuck. Most party members are Remainers, and they are the ones who is it comes to it are out knocking on doors, posting campaign leaflets and on voting day giving lifts to prospective voters. Alienating that group should not be undertaken lightly.