Brexit: Johnson says Britain will leave EU on 31 October 'do or die'

Boris Johnson arrives for a walkabout at a garden centre in Surrey on Tuesday.Photograph: Peter Nicholls/ReutersBoris Johnson has hardened his position on leaving the EU “do or die” by the end of October, as hardline Eurosceptics extended their influence on his faltering campaign to be prime minister.The frontrunner toughened his Brexit stance as criticism continued over his refusal to answer questions about a police visit to his flat following a loud late-night altercation with his