Former police detective Mark Williams-Thomas described Wednesday’s inquest as “disappointing” and said as a result he had “decided to speak out on a number of points”

Former detective Mark Williams-Thomas worked with Jay Slater’s family after he disappeared last June(Image: Stan Kujawa)

A former British police detective claims a key witness not traced by the coroner has given him “crucial evidence” about the Jay Slater case.

Mark Williams-Thomas, who flew to Tenerife to work for the apprentice bricklayer’s family following his disappearance, says testimony given to him by convicted drug dealer Ayub Qassim provides answers as to Jay’s decision-making on the day he died. Qassim and pal Steven Roccas had rented an Airbnb near Masca, which Jay visited in the hours before his death, but neither attended yesterday’s inquest hearing after the court heard their whereabouts are unknown.

Mr Williams-Thomas said: “The most important witness the police have also been unable to trace is Ayub Qassim. It’s from Ayub I have some very crucial evidence that has not yet been made public and does provide, I believe, greater context as to why Jay left that property on that morning and took the decision to walk.

Apprentice bricklayer Jay was found dead after a 28-day search in Tenerife(Image: PA)

“Debbie was asked yesterday was she happy for the statements of Ayub and Roccas to be read out and she said ‘no, I want them to attend court’. Quite rightly so.”

Mr Williams-Thomas says he is happy to share his information with both the Spanish and British authorities, but he suggested the Spanish authorities have questions to answer about their investigation.

He said: “At the time I offered all my evidence to the Spanish police, but they never responded. I remain happy to share everything I have with them. Equally, I’m happy to share all my information with Lancashire Police. “I think it’s fair to say that after yesterday’s hearing the family will feel disappointed and certainly does not leave one with the view that the police investigation has been both thorough and meticulous. To add to the questionable quality of the police investigation, one important image relating to the watch being stolen apparently has now been deleted by the police.”

The former British police detective was seen carrying out inquiries in the area where Jay went missing(Image: Stan Kujawa)

Mr Williams-Thomas described Wednesday’s inquest as “disappointing” and said as a result he had “decided to speak out on a number of points”. He said: “My thoughts remain with Debbie and the family, especially as a time when they have told how poor the police investigation has been.

“As the family of a loved one, who has died requiring a police investigation, all they want to know is that that investigation has been thorough, has spoken to all the witnesses, has been detailed and crucially, they have retained and collected all the evidence that relates to that investigation.”

Mr Williams-Thomas previously revealed that Jay had boasted of stealing an expensive watch and had been carrying two knives, which was confirmed at Wednesday’s inquest. He said: “I can confirm that although Jay was pictured with two knives in his waist as he stood on the steps of that rental, the knives I’m told were not found with him. And crucially the knives, I’m told, were still in that apartment so they didn’t leave that property when he left.”

The holiday apartment in Masca, where Jay stayed in the hours before he disappeared(Image: Stan Kujawa)

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On Wednesday, the inquest at Preston Coroner’s Court heard Jay, 19, had a fractured skull and party drugs in his system when he was found in a remote area of Tenerife and died from “devastating” injuries after vanishing in the mountains of the island in the Canaries for 28 days last summer.

Jay, from Oswaldtwistle, Lancs, had flown out to attend a music festival with pals before becoming separated from them after attending the NRG Festival in the Los Cristianos area. Toxicology expert Dr Stephanie Martin told the hearing there were difficulties checking for the presence of drugs or alcohol as the body was severely decomposed.

But she said analysis showed traces of the presence of MDMA and MDA, commonly known as ecstasy, along with cocaine and alcohol. Spanish samples also showed the presence of ketamine when analysed, which was not found in the UK samples, the hearing was told.

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Jay’s mum Debbie seen at his inquest on Wednesday(Image: CHRIS NEILL)

Jay’s distraught mum Debbie asked coroner Dr James Adeley to adjourn the hearing until several witnesses who could not be located, including Jay’s friends, are found. As well as Qassim and Roccas, they also include Jay’s pals Lucy Law, Brandon Hodges and Bradley Geoghegan, who also uses the surname Hargreaves.

Mr Williams-Thomas said: “I note the police have been unable to find Lucy Law to attend the hearing. I have many recordings and conversations with Lucy, who fully co-operated right from the very beginning and helped me piece together the events of that evening and of the morning Jay left.”

He added: “Whilst I took a great deal of criticism throughout my coverage of the case, looking back, it’s clear, now that the evidence has come out of court and in particular with regard to pathologists, that sadly it was a tragic accident. There was no third party involvement, which I was very clear to make an assessment on, in the very early days.”