Workers and travellers crossing into Gibraltar from Spain could be held up in 14-hour-long queues if a post-Brexit deal can’t be reached, the mayor of the Rock’s Spanish border town has warned. The mayor of La Linea, Juan Franco, said that if Britain and Spain couldn’t agree on a deal, his own city – which relies on its economic ties to Gibraltar – would face drastic consequences. Franco has said that a no-deal situation could push property prices up, and funnel thousands of people away from legitimate work and into the throes of organised crime. Speaking to The Telegraph on Wednesday, the may…