Jay Slater went missing while on holiday on the island of Tenerife last week. The last known contact the 19-year-old had was during a short phone call to a friend, in which he said he had missed a bus trying to get back to his accommodation and so was attempting to walk instead - a journey that would take 11 hours.      Rescue teams including helicopters, rescue dogs and drones have entered the second week of the search, as his family and friends become desperate for answers. What could have happened to him?      On this episode, Niall Paterson learns more about Jay Slater’s story and what might have happened to him from our correspondent Shingi Mararike. Plus, Sue Sim, former chief constable of Northumbria Police, joins Niall to discuss the social media wildfire surrounding the case.  Producer: Emma Rae Woodhouse  Editor: Philly Beaumont