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 English. It’s been a very slow process here so we need the British police to come out and help them.”

In a statement on Slater’s disappearance today, Lancashire Police explained it had offered to provide additional support to Guardia Civil on the island.

“They must be going through the most distressing ordeal not knowing what has happened to their loved one,” they said.

“We have specialist officers who are continuing to support Jay's family.

Last known location of Jay Slater

Mountains of Tenerife where Jay Slater disappeared

“Whilst this case falls outside the jurisdiction of UK policing, we have made an offer of support to the Guardia Civil to see if they need any additional resources.

“They have confirmed that at this time they are satisfied that they have the resources they need, but that offer remains open and they will contact us should that position change.

“Once again, our thoughts remain with Jay's family and friends at this distressing time.”