As Frances says, there is something very nineteenth century about a focus on tariffs and free trade agreements. The UK economy in 2017 doesn’t work like that any more. It is no longer the workshop of the world. It is a section within a vast production line that stretches across Europe. Disrupting that will do severe damage to all its parts but it will be easier for the rest of the EU to repair its parts than it will be for us to repair ours. The more obstacles we put in the way of trade, the worse it will be. Whatever happens, this is going to cost us dearly.