“His room is still the same” and “there’s always a missing chair around the table”, says Pip, whose younger brother Sanjiv Kundi was 41 when he vanished in Paris 11 years ago.

She has visited the French capital many times since he left the family home in Leamington Spa, Warwickshire, for a week’s holiday – always wondering if she will see his face in the crowd.

Sanjiv was the “apple of my parents’ eye”, she says, their only son surrounded by four sisters, but he struggled with his mental health in the years before his disappearance.

Distinctive looking, standing at around 6ft 2inch inches tall with dark, greying curly hair and a beard, Sanjiv was wearing glasses, a heavy brown, three-quarter length coat and brown cargo trousers when he took the 4.22pm Eurostar from St Pancras.

He arrived at Gare du Nord station on the evening of 25 September 2013 but what happened next remains a mystery.

He is believed to have returned to the station the following day to buy a ticket home for 1 October but there’s no available CCTV footage, and his cards and mobile phone have not been used since he went missing.

The impact on Sanjiv’s family has been devastating, his parents now in their 80s, his nephews all grown up, are still no closer to getting any answers.

Pip wonders if he’s been a victim of crime, if something sinister has happened to him, or if he’s decided to live that way.

‘Somebody somewhere knows something’

If he has, she wants him to know he’s “deeply missed” and his family just want to know he’s safe – but she does not think he intentionally wanted to go missing.

“In this day and age, with all the technology we have, I can’t understand why nobody saw my brother that day,” says Pip.

“Somebody somewhere knows something.”

Her family is one of the many living with the nightmare of searching for a loved one who has gone missing abroad.

The LBT Global charity, which helped Jay Slater’s relatives after he disappeared while on holiday in Tenerife, says it gets about 3,000 enquiries a year and takes on about 300 to 400 of those cases.

But only a fraction get the same type of publicity as the 19-year-old, whose body was found in a ravine 29 days after he went missing, or television doctor Michael Mosley, 67, who was found dead four days after he disappeared on the Greek island of Symi.

Middle-aged men and those with mental health issues tend not to generate the same headlines as the young, photogenic or famous, says Matt Searle, LBT Global’s chief executive.

But the “extraordinary” case of Madeleine McCann, who was aged three when she disappeared from her holiday apartment in Portugal on 3 May 2007, set a “very public benchmark” for what people expect.

‘A missing foreigner is bottom of the pile’

Police in the UK have a duty to take statements and pass the information through Interpol to the relevant foreign police force, but they do not have any jurisdiction to carry out an investigation.

There are currently 69 Interpol yellow notices – the global police alerts issued to help locate people, including cases of suspected kidnappings and abductions – for British people, including Madeleine.

Most families will not get much support from the authorities and in some countries, “a missing foreigner is absolutely bottom of the pile”, says Matt, while those who go out to search themselves may not even be able to read the road signs.

“It’s a very lonely world for people who’ve got someone missing overseas,” he says.

“A huge part of every operation is explaining why the British police, the prime minister, the foreign secretary, aren’t all flying out there,” he says.

“It just doesn’t happen. You have to explain that the British government can’t do that. The Met Police aren’t going to be flying out in helicopters, going to look for them, you know, we’re not going to get any of that.

“But what we do is say, depending on what the case needs, we could try and find a local guy with a drone, mobilise local search and rescue, or fundraise to get on-the-ground support.”

‘We’ve been to the morgues’

Pip’s family has had virtually no contact with the French police and a year after Sanjiv went missing his file was shoved in a drawer, she says, so they were left to drive the search themselves.

She went to areas in Paris that were popular with rough sleepers, handed out leaflets and posters and appeared on French radio and TV.

“We’ve been to the morgues. We’ve been to the hospital,” she says. “And you can’t believe you still can’t find a scrap of anything to tell us what happened when he left that station.”

Pip has been assisted by the Missing People charity. It says 170,000 people a year, or one every 90 seconds, are reported missing in the UK, but lists the details of just 38 people missing abroad.

They include the high-profile cases of Madeleine McCann and Ben Needham, who was 21 months old when he disappeared on the Greek island of Kos in 1991.

While Sanjiv has attracted some publicity over the years, the coverage of the famous cases sometimes makes Pip think: “Why not my brother?”

Around 80% of cases resolved

LBT Global, which specialises in helping families whose relatives are missing abroad, has around 860 open cases, some going back 20 years.

The charity is able to tell around 80% of the people it works with what happened. Around half of those are happy endings, says Matt.

Alex Batty went missing aged 11 in 2017 after his mother Melanie Batty, who was not his legal guardian, took him on a pre-arranged trip to Spain with his grandfather.

They lived “off-grid” leading a nomadic lifestyle in southern France for six years until Alex made the decision to walk out and was found walking in darkness carrying his skateboard by a French delivery driver near Toulouse.

He was reunited with his grandmother and legal guardian Susan Caruana at his former home in Oldham, Greater Manchester, just before Christmas last year.

In other cases, a missing person is found in prison overseas or dead.

“Even being able to tell them that someone has died can be a relief for them, because at least they can move on with a grieving journey then, and we can make arrangements to repatriate the body, and they can have a burial,” says Matt.

“And it’s surprising how often a family will say, ‘I wish I knew they were dead rather than just not knowing at all’.”

Harder still, he says, is telling a family they are alive and well but they do not want to speak to them ever again. The reasons for this can vary but typically include a family breakdown, criminal activity within a family or they just want to leave their old life behind.

‘Never lose hope’

In those cases, Matt has to tell the family: “I’m sorry, but we can’t search for them anymore. They told me they don’t want to be found and they don’t want to be in touch.”

But living in long-term limbo like Pip’s family is also incredibly hard.

They have gone through all the stages of bereavement, from shock to denial, to depression and anger at “why isn’t anybody looking for him?”

And when a new high-profile missing person’s case like Jay Slater hits the headlines it “brings it all back”.

“Every person out there whose family member is missing could almost feel and touch the emotion that [family] was going through,” says Pip.

LBT Global’s oldest cases date back to 2004 or 2005 but Matt says his charity has located people who have been missing for more than 20 years.

“The message to families is never lose hope,” he says.

Missing People runs a free and confidential helpline for those affected by a disappearance. You can text or call them on 116 000 or send an email to 11600@missingpeople.org.uk.