Jay Slater 'veered off main road and could have slipped on rocks' during final phone call with his best friend – as Spanish cops issue appeal for volunteers to join 'massive search'

Jay Slater veered off the main road and may have slid down rocks while on a phone call with his best friend as he tried to make his way back to his accommodation from the remote mountains of Tenerife.

Brad Hargreaves, who Jay was partying with at the three-day NRG music festival on the Spanish island, has spoken for the first time since his friend vanished on June 17.

Jay, from Oswaldtwistle, Lancashire, has not been seen since he went back to an Airbnb near the remote village of Masca with…