epa05361988 Former British Prime Minister Gordon Brown (L) delivers a speech at a ‘Remain In’ event in Leicester, Britain, 13 June 2016. Britons will vote on whether to remain in or leave the EU in a referendum on 23 June 2016. EPA/WILL OLIVER EPA/WILL OLIVER <저작권자(c) 연합뉴스, 무단 전재-재배포 금지>

UK Independence Party leader Nigel Farage (R) campaigns for Brexit in Sittingbourne on June 13, 2016. Britain‘s opposition Labour Party today scrambled to make the case for Europe to its members as world stock markets slipped amid concern over a British exit from the EU in a knife-edge referendum next week. / AFP PHOTO / CHRIS J RATCLIFFE <저작권자(c) 연합뉴스, 무단 전재-재배포 금지>