William Dartmouth, Ukip deputy chair and national spokesman on trade, and MEP for the South West of England and Gibraltar, writes:

Philip Hammond, the Foreign Secretary, has written that it is ‘clear what the central trade-off will be: access to the single market versus freedom of movement’. Many ­commentators and establishment ­politicians agree with him. This is simply wrong.

In 2015, China, the United States, Russia, Japan, India and Brazil exported goods to the value of €864,855m to the EU. None of these countries have ‘freedom of movement’ with the EU. None of them even have a trade agreement with it.

As a fact, it is only the four countries in the European Free Trade Association – Switzerland, Liechtenstein, Iceland and Norway – whose trade agreements require ­freedom of movement.

Of these, Liechtenstein has a derogation and Switzerland voted against freedom of movement in a referendum.

So that leaves just two ­countries – Norway and Iceland – that have granted freedom of movement in return for access.