It is central to the argument of the campaign to leave the EU, that Britain needs "trade agreements" with the non-EU world. (Forget for one moment that we do enjoy such agreements with about 70 countries by virtue of our membership of the EU)
Why is it important to Brexiters to have trade agreements with the Far East, Africa, Australasia and the Americas? Indeed any suggestion we should be in the EU Customs Union draws howls of protest from Brexiters. They say it would mean we could not have independent trade agreements elsewhere.
However Brexiters are perfectly happy to trade with Europe, by far our largest trading partner on WTO terms. So if WTO terms are ok for trade with the EU, why not with China, America, India etc?
This is a central paradox in the Brexit argument, which so far no Brexiter has been able to explain to me. I heard David Gauke, the Justice Secretary, also mention his own failure to get an answer to the question.
I'm not looking to have an argument here, simply an explanation.