On 23rd June 2016 the UK will hold a referendum on its membership of the European Union. Should the UK choose to leave the EU, the consequences would be profound for both the UK and the EU. The UK would place itself outside the single market, with important implications for UK businesses that trade with the EU and for any business that uses the UK as a base for trading with, or investing in the EU. For the rest of the EU the shock of a UK exit could have important consequences: would it push the rest of the EU closer, or threaten to pull it apart? So how worried should we be about Britain leaving the EU? Will it happen? And if it happens, what are the most important potential risks and consequences for Asia?