The warning came from Travelzoo UK managing director Joel Brandon-Bravo. His comment follow Virgin Group founder Sir Richard Branson declaring that travel has already been severely damaged by the fallout from Brexit. Invoking Article 50 will mean a move “from a period of travel uncertainty to the definite unknown” as the UK enters negotiations with Brussels, Brandon-Bravo said. Get the full story at Travel Weekly UK Read also "Branson: 'The travel industry would be foolish not to speak out on Brexit'" at TTG and Travel Weekly