"The claim: The UK trades with "the rest of the world" (non-EU countries) under World Trade Organization (WTO) rules.
The EU and the UK have said they want to reach an agreement on future trade, but leading Brexiteers say failing to reach a deal would not be disastrous. They have said the UK could revert to rules set by the WTO, and have claimed that's how we currently trade with the rest of the world.
"It is perfectly fine for the UK to leave and trade with [the EU] as we trade with the rest of the world at the moment, under world trade rules," said MP John Redwood on 19 October.
"Even if we leave [the EU] without a deal, we still get most favoured nation status under WTO rules, which is how we trade with the rest of the world," said Bernard Jenkin MP on 17 January.
Reality Check verdict: This is wrong. With regard to tariffs, the UK trades with 24 countries and territories under WTO rules alone. With 68 others it has, as part of the EU, free trade agreements, either fully or partly in place, which all enable trade on better terms."
www.bbc.co.uk/news/uk-politics-41859691