Rag, that may be the definition but no government applies tariffs to its own exports. Only imports.
Steve, both Labour and Tories are split on this.
However good our negotiators, EU have to string us along. They can not afford to lose either our contribution or our market. Their only hope is that we change our mind and stay, so they will never make us a fair offer to leave.

Free trade would be beneficial and might be worth paying for, but how can we agree a price until we know what the trade deal is?