Organisers of the Facebook page dedicated to the search for missing Sheffield toddler Ben Needham are urging holidaymakers to check old holiday films if they were in Kos in 1991.
In a recent meeting with Calendar producer Mark Witty, Ben's grandmother recalled a tourist filming Ben at the Palm Beach Hotel in Kos - but that person has never been traced.
Christine believes the woman, who was aged approximately between 30-45, was possibly Scandinavian, based on her accent. She had long blonde hair tied up in a bun. Christine recalls Ben being filmed as he played by the hotel pool in June or July 1991.
Ben went missing on July 24 1991, as he played outside a farmhouse on the Greek island which was being renovated by his grandfather Eddie. Ben had been taken to the location in Irakles by Christine on the day he disappeared.
Messages in Danish, Swedish and Norwegian are being posted on Facebook and social media by "Help Find Ben Needham" in an attempt to reach Scandinavian tourists who may have been in Kos in the summer of 1991. Click here to be directed to the Facebook page.
The official Twitter account backing the search for Madeleine McCann has blocked the account which supports the campaign to find Ben NeedhamRead the full story ›
A social media event last night to mark the 24th anniversary of the disappearance of Ben Needham was one of the highest trending events of its type in the world.
The event - known as a "Thunderclap" - sent a message about the on-going search for Ben to nearly 1.5m people connected to those who had signed up on Twitter and Facebook.
The toddler disappeared from Kos on July the 24th 1991 - the search is being supported by a South Yorkshire Police team backed by a Home Office grant of £700,000.
Kerry Needham spoke to Gaynor Barnes in our studio about the latest developments in Greece, as well as the "Thunderclap" social media campaign by Ben's Facebook team, which has reached more than a million people.
She also spoke of how she has coped since March, when she visited Greece to meet a man who thought he was Ben.
DNA sadly proved this was not the case.
The 24th anniversary of Ben Needham's disappearance from Kos is being marked today, as officers from Operation Ben reveal information for the first time about their investigations in Greece earlier this year.
Ben, aged 21 months, vanished from outside the farmhouse his grandad Eddie was renovating in the north of the island.
For more than two decades the Needhams have believed a prisoner in a Greek jail and a notorious criminal family in the north of the country had vital evidence about Ben's whereabouts
After 24 years they have finally been interviewed, and what they said may have changed the course of the investigation.
Mark Witty reports:
24 years to the day after Ben Needham disappeared, police reveal they've spoken to a prisoner who claimed he knew Ben's whereabouts.Read the full story ›
Police investigating the disappearance of Ben Needham have revealed information about a recent trip to Greece, where they interviewed people who have been linked to the case for two decades.
Ben was 21 months old when he disappeared from the island of Kos 24 years ago today.
Detectives say they have spoken to a prisoner in jail who claimed to know Ben's whereabouts 19 years ago. Detective Inspector Jon Cousins from South Yorkshire Police says officers are analysing the testimony to see if the man's evidence is plausible.
South Yorkshire Police say they have found no evidence to link to a Greek Gypsy family to the disappearance of Ben Needham 24-years ago.
Ben disappeared from Kos in July 1991. In the last week officers have been in northern Greece investigating claims that a particular family may have been responsible, but no link was found. The team also followed up leads resulting from a Greek TV appeal , but police say nothing of significance has yet emerged from the calls.
Over the past week, a team of officers from South Yorkshire Police have been in the northern region of mainland Greece, thoroughly investigating claims made over the past 20 years that a particular family may have been responsible for the disappearance of Ben Needham from the island of Kos in July 1991.
That investigation has not found any evidence to link that family to Ben's disappearance, or that they have any knowledge of his current whereabouts. The team has also followed up many leads which came as a result of the direct appeal to the Greek people, speaking with several of those who came forward. Although some of those enquiries are yet to be finalised, there is nothing of significance at this time to identify how Ben disappeared or his current whereabouts.
The investigation is continuing to ensure that all further potential lines of enquiry are pursued and we are ensuring Ben's family is kept updated.
Police in South Yorkshire are to examine another lead which emerged after the case of Ben Needham was featured on Greek TV last night.
It is the second time in a week the story has taken centre stage on one of the country's most popular programmes.
The programme "Light at the End of the Tunnel" ran updates on the show last night after an appearance by Ben's family and South Yorkshire Police the week before prompted hundred of calls and emails about Ben's disappearance from Kos in July 1991.
That appeal created seven leads described by South Yorkshire Police as "potentially interesting".
Last night the programme ran Calendar footage of Kerry's reaction back in the UK and spoke to the Greek-born Police Inspector Panos Dedes , who has been seconded to South Yorkshire from Northumbria Police, who appealed for information.
Earlier in the programme a picture was sent which the presenter , Aggeliki Nikolouli, clearly believed had a resemblance to Ben .
This was forwarded to Inspector Dedes to show the Operation Ben team and the Needham family, who were watching the programme through a live web link.
It could be a number of weeks until all the calls from the programme on May 15 are followed up, but Kerry believes the Greek public have a major part to play in solving the family's 24-year agony.
The family of Ben Needham will lead a fresh appeal on Greek television tonight for information into the toddler's disappearance 24 years ago.
Ben's mother, Kerry, and South Yorkshire Police investigators will appear on the programme Light at the End of the Tunnel which tries to reunite missing people with their families