British police have offered to help in the search for Jay Slater, a British teenager who went missing in Tenerife last Monday. Spanish police have so far declined the offer as the massive search effort reaches its sixth day. Drones and sniffer dogs have so far been brought in to assist the search, but friends of the missing teen say local forces are “not doing a good enough job”. Lucy Law, who received a phonecall from Slater on the morning of his disappearance, told the Times: “We are having to do this all by ourselves as Spanish police are not doing a good enough job. “They don’t even speak …