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Former London Mayor, and 'Vote Leave' campaigner, Boris Johnson speaks to the press ahead of meeting with members of the public and supporters in Piercebridge, near Darlington, north-east England on June 22, 2016, as he continues to campaign for a Brexit ahead of the June 23 EU referendum. Wednesday is the last day of campaigning for Britain's referendum on whether or not to stay in the EU, a momentous decision with far-reaching implications for Britain and Europe. / AFP / SCOTT HEPPELL (Photo credit should read SCOTT HEPPELL/AFP/Getty Images)

Former London Mayor, and 'Vote Leave' campaigner, Boris Johnson speaks to the press ahead of meeting with members of the public and supporters in Piercebridge, near Darlington, north-east England on June 22, 2016, as he continues to campaign for a Brexit ahead of the June 23 EU referendum.
Wednesday is the last day of campaigning for Britain's referendum on whether or not to stay in the EU, a momentous decision with far-reaching implications for Britain and Europe.
 / AFP / SCOTT HEPPELL        (Photo credit should read SCOTT HEPPELL/AFP/Getty Images)