Brexit and Britain - what would it mean for UK trade?

By William Schomberg LONDON (Reuters) - The stakes will be high for Britain's historic role as a free-trading nation when it holds a referendum on whether to stay in the European Union on June 23. There is no precedent for an economy as big as Britain's leaving a trade bloc, and the rival campaigns paint contrasting pictures of what quitting the EU might mean for its trade. Britain's most important trade partnership is with the EU's single market, the world's biggest trade area.