The rescue efforts for missing British teenager Jay Slater on the Spanish island of Tenerife entered its seventh day on Sunday – a day after his father Warren Slater visited the site of his son’s disappearance and described the situation as a “nightmare”. “Just hoping that somebody has helped him off this mountain,” his father told media. “That’s all I want, that somebody has helped him get off this mountain,” Slater added. The 19-year-old was holidaying on the Canary island with two friends when he went missing in the early hours of Monday, June 17, after attending a music festival. Slater ha…