LONDON, ENGLAND - OCTOBER 13:  Phil Jones, 'People's Challenge' member waves an EU flag outside  the Royal Courts of Justice on October 13, 2016 in London, England.  Investment manager Gina Miller is leading a battle contesting the government's authority to trigger Article 50 of the Lisbon Treaty to leave the European Union without recourse to Parliament.  (Photo by Dan Kitwood/Getty Images)