The search for missing teenager Jay Slater has moved to some caves next to a ravine in a remote part of Tenerife. The 19-year-old flew from Lancashire to the Canary Islands for a music festival but disappeared after he went to stay with people he met during a night out on June 16. During his final call to his friend Lucy Law at 8am local time last Monday, the 19-year-old said his phone had only one per cent battery, he was thirsty and he did not know where he was. His last location showed he was in the Rural de Teno Park – an area popular among hikers. He has not been seen since. Today marks t…