UK Independence Party (UKIP) leader Nigel Farage (L) talks with EU Commission President Jean-Claude Juncker before a plenary session at the EU headquarters in Brussels on June 28, 2016. European Commission chief Jean-Claude Juncker called on June 28 on Prime Minister David Cameron to clarify quickly when Britain intends to leave the EU, saying there can be no negotiation on future ties before London formally applies to exit. / AFP PHOTO / JOHN THYS