Leave campaigners suggest the UK can easily negotiate a free trade agreement with the EU and be free to negotiate with other emerging economies in the Far East and Latin America.

Those arguing to Remain, however, suggest that being in the EU gives us preferential access to a market of 500m people. One of those is Miriam Gonzalez Durantez - the wife of former Deputy Prime Minister Nick Clegg and a lawyer who specialises in free trade negotiations.

She debates UK trade with Leave campaigner Iain Duncan Smith.