How Will the Official Brexit Referendum Group Be Chosen?

And then there were two. With the launch of Vote Leave, there is now a 2nd major group campaigning for Britain to exit the EU, alongside Leave.EU.

U.K. Independence Party (UKIP) leader Nigel Farage (L) and major donor Arron Banks leave the party's head office in central London on May 15, 2015. Justin Tallis/AFP/Getty Images

READ MORE

• Why the Bank of England Wants Britain to Stay in the EU
• Campaign to Keep Britain in EU Warns Exit Would Weaken Country