His mother, a team of mountain rescuers, and the local civil guard are searching for him after he disappeared while holidaying with friends.
Ms Law said he rang her to say he “didn’t know where he was”, that he “needed a drink” and had “cut his leg on a cactus”.
Despite his mobile phone battery being down to 1% he managed to send her a photo of his location.
When she told him to return to where he had walked from, he said he did not know where that was, Ms Law said.
He was without food and water, she added, and had been in a T-shirt and shorts. “It’s very warm in the day and very cold at night,” she told the UK Tonight programme on Sky News.
“So in the day he’s going to be really warm without a drink, and then at night he’s going to be very cold without any suitable clothing.”
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Ms Law and others have printed off posters in both Spanish and English and have plastered them “everywhere”, she said.
Image: Jay Slater’s phone’s last live location was Rural de Teno Park. The search has also focused on Los Cristianos
Soon after Mr Slater went missing, an American woman offered to drive Ms Law up into the mountains.
There was “literally no sign of him anywhere”, she said. “We drove around all day.”
Mr Slater had posted a picture online of some mountains next to a house he had been to.
Ms Law drove around looking for a lamp and some flowers seen in that picture.
“We managed to find the house,” she said. “I knocked on the door and there were two people there.”
They told Ms Law that Mr Slater had gone out for a cigarette before going back in and saying he wanted to go home.
Image: Masca, Rural de Teno Park, Tenerife. Pic: iStock
“They told me he’d spoken to the next door neighbours and they’d told him there was a bus every 10 minutes back down to Los Cristianos.
“The bus stop was right next to the house. So obviously if he’d gone to get the bus he wouldn’t have got lost because it [the stop] was visible from the front door.”
The trip back down from the mountains is an hour’s drive. “Everything looks the same – it’s just a road and hills,” Ms Law said.
“I can’t understand why he would come out of the house and then decide he was going to walk. I think he maybe set off walking with battery and had not realised how far the walk actually is.”
There are “so many questions that are unanswered”, Mr Slater’s friend said.
Image: Jay Slater and his mother, Debbie Duncan. Pic: Lucy Law
‘He’s not a stupid boy’
“The thing I find the most weird about this is the fact that there’s nobody that’s seen him.
“And he’s not a stupid boy – he’s got some nous about him.
“I’ve seen so many people up here and I’ve asked every single one if they’ve seen him – this is what I find weird.
“If he’d seen somebody, or a car, he would have flagged down the car – he would have said he needed a phone to contact someone.”
She added: “He would never have his family worrying like this – he would never have us worrying like this.
“If he saw someone, the first thing he would do is say ‘I need to ring my mum’ – I know that for a fact. He would never ever have his mum worrying like this.
“It’s just awful – I’ve never in my life been so worried.
“I’ve literally not slept at all since.”
The Spanish Civil Guard told UK media they are “doing everything possible” to find Mr Slater.
“A specialist mountain rescue and intervention group called the Greim have been mobilised.
“A police helicopter is also out and focusing on the area around the village of Masca.
“Other emergency services including firefighters have also been mobilised.”
A nationwide police operation to track down those in grooming gangs has been announced by the Home Office.
The National Crime Agency (NCA) will target those who have sexually exploited children as part of a grooming gang, and will investigate cases that were not previously progressed.
Home Secretary Yvette Cooper said in a statement: “The vulnerable young girls who suffered unimaginable abuse at the hands of groups of adult men have now grown into brave women who are rightly demanding justice for what they went through when they were just children.
“Not enough people listened to them then. That was wrong and unforgivable. We are changing that now.
“More than 800 grooming gang cases have already been identified by police after I asked them to look again at cases which had closed too early.
“Now we are asking the National Crime Agency to lead a major nationwide operation to track down more perpetrators and bring them to justice.”
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Starmer to launch new grooming gang inquiry
The NCA will work in partnership with police forces around the country and specialist officers from the Child Sexual Exploitation Taskforce, Operation Hydrant – which supports police forces to address all complex and high-profile cases of child sexual abuse – and the Tackling Organised Exploitation Programme.
It comes after Sir Keir Starmer announced a national inquiry into child sex abuse on Saturday, ahead of the release of a government-requested audit into the scale of grooming gangs across the country, which concluded a nationwide probe was necessary.
The prime minister previously argued a national inquiry was not necessary, but changed his view following an audit into group-based child sexual abuse led by Baroness Casey, set to be published next week.
Ms Cooper is set to address parliament on Monday about the findings of the near 200-page report, which is expected to warn that white British girls were “institutionally ignored for fear of racism”.
One person familiar with the report said it details the institutional failures in treating young girls and cites a decade of lost action from the Independent Inquiry into Child Sexual Abuse (IICSA), set up in 2014 to investigate grooming gangs in Rotherham.
The report is also expected to link illegal immigration with the exploitation of young girls.
Career spy Blaise Metreweli will become the first woman to head MI6 in a “historic appointment”, the prime minister has announced.
She will take over from Sir Richard Moore as the 18th Chief, also known as “C”, when he steps down in the autumn.
“The historic appointment of Blaise Metreweli comes at a time when the work of our intelligence services has never been more vital,” Sir Keir Starmer said in a statement released on Sunday night.
“The United Kingdom is facing threats on an unprecedented scale – be it aggressors who send their spy ships to our waters or hackers whose sophisticated cyber plots seek to disrupt our public services.”
Of the other main spy agencies, GCHQis also under female command for the first time.
Anne Keast-Butler took on the role in 2023, while MI5 has previously twice been led by a woman.
Until now, a female spy chief had only headed MI6– also known as the Secret Intelligence Service (SIS) – in the James Bond movies.
Image: Blaise Metreweli is the first woman to be named head of MI6. Pic: Reuters
Dame Judi Dench held the fictional role – called “M” in the films instead of “C” – between 1995 and 2015.
Ms Metreweli currently serves as “Q”, one of four director generals inside MI6.
The position – also made famous by the James Bond films, with the fictional “Q” producing an array of spy gadgets – means she is responsible for technology and innovation.
Ms Metreweli, a Cambridge graduate, joined MI6 in 1999.
Unlike the outgoing chief, who spent some of his service as a regular diplomat in the foreign office, including as ambassador to Turkey, she has spent her entire career as an intelligence officer.
Much of that time was dedicated to operational roles in the Middle East and Europe.
Ms Metreweli, who is highly regarded by colleagues, also worked as a director at MI5.
In a statement, she said she was “proud and honoured to be asked to lead my service”.
“MI6 plays a vital role – with MI5 and GCHQ – in keeping the British people safe and promoting UK interests overseas,” she said.
“I look forward to continuing that work alongside the brave officers and agents of MI6 and our many international partners.”
Sir Richard said: “Blaise is a highly accomplished intelligence officer and leader, and one of our foremost thinkers on technology. I am excited to welcome her as the first female head of MI6.”
A woman has died after falling into the water at a popular beauty spot in the Scottish Highlands.
The 23-year-old had fallen into the water in the Rogie Falls area of Wester Ross.
Police Scotland confirmed emergency services attended the scene after being called at 1.45pm on Saturday.
“However, [she] was pronounced dead at the scene,” a spokesperson said.
“There are no suspicious circumstances and a report will be submitted to the Procurator Fiscal.”
Rogie Falls are a series of waterfalls on the Black Water, a river in Ross-shire in the Highlands of Scotland. They are a popular attraction for tourists on Scotland’s North Coast 500 road trip.