Britain votes in highly unpredictable election As the UK is about to hold a national election, opinion polls suggest Prime Minister Theresa MayÕs lead over Jeremy CorbynÕs Labour Party has ebbed, putting her majority in doubt Jun 23, 2016: EU referendum Jul 13: Theresa May becomes prime minister following David Cameron resignation Sep 24: Jeremy Corbyn re-elected as leader of Labour Party, ending ÒcoupÓ by more centrist lawmakers Mar 22, 2017: LondonÕs Westminster Bridge terror attack Mar 29: Theresa May triggers Article 50, formally beginning UKÕs departure from EU Apr 18: May calls snap election May 22: Manchester terror attack Jun 3: London Bridge attack Jun 8: Election 2016 Jun Jul Aug Sep Oct Nov Dec 2017 Jan Feb Mar Apr May Jun Poll of Jun 4 Con: 43.8% Lab: 36.1% Lib Dem: 8.1% UKIP: 4.3% Green: 2% Lines represent average of all mainstream polls aggregated by Britain Elects Source: Britain Elects Pictures: Getty Images