Chelsea pensioners are ushered into a polling station to cast their ballot papers at the Royal Hospital in Chelsea, west London on June 23, 2016, as Britain holds a referendum to vote on whether to remain in, or to leave the European Union (EU). Millions of Britons began voting Thursday in a bitterly-fought, knife-edge referendum that could tear up the island nation's EU membership and spark the greatest emergency of the bloc's 60-year history. / AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)
