EU referendum, brexit and the aftermath

Adding more complexity, there may also be issues for WTO members making agreements with non WTO members (so, pretty much every state in the world with the UK).

http://m.jiel.oxfordjournals.org/content/8/4/825.short

And:

There is no reason for WTO members to give the UK an easy ride – quite the opposite, in fact. As part of the EU, the UK demanded a pound of flesh from African, Caribbean and Pacific countries in the recent Economic Partnership Agreements; these countries may now seek payback.

Then there are late WTO joiners such as China and Russia who were required to make far greater concessions than existing members; they too may now seek to extract additional concessions from the UK in return. Desperate to cement its position in the WTO and no longer able to rely on the combined power of the EU, the UK lacks significant bargaining leverage.

https://theconversation.com/why-uk-could-be-doomed-to-years-without-proper-access-to-world-trade-61782