A TV detective says third-party involvement and the ‘drug underworld’ of Tenerife’ is a ‘line of enquiry’ in the hunt for missing teenager Jay Slater.

Mark Williams-Thomas, a former police officer, held a press conference in Tenerife today (June 26).

He said he has spoken with Jay’s family. He says if Jay is not found then third-party involvement in his disappearance could be considered.

He said: “I don’t believe he is in close proximity to the rental. It’s a very easy area to search.

“If he has come to harm, it’s either the other side of the lookout point, or it is further down towards the town.

“Police are searching very well. They have mountain rescue and a lot of people are up there.

“He will be found. If he’s not found it brings that other element which is third party [involvement].”

Mark said there is a ‘drug underworld’ on the island.

He said: “I have received information there is no doubt an underworld here… a big drugs [culture].

“I can’t tell you at the moment whether that has had a big impact. I have only been here less than 48 hours.

“What I can tell you is the information I currently have. The family has shared everything with me.

“I have a lot of messages and WhatsApp chats. This is a line of enquiry.”

READ MORE: Jay Slater: Live updates on missing teenager

The former detective, who is best known for 'exposing' Jimmy Savile after his death, says he has interviewed many witnesses but still has not managed to speak to two 'key people' who have now returned to the UK. 

These are two men who took Jay to the holiday rental.

He said: “There are two key people that I have not spoken to. These are two men that took Jay back to the holiday rental in the hills. They have spoken to the police. They are now back in England."

Jay has not been seen since Monday, June 17. At the time of writing, there haven’t been any major breakthroughs in the search for the missing Oswaldtwistle teenager.