The father of missing toddler Ben Needham has undergone regression therapy to try to help police find his son.
Simon Ward, 43, spent days with two specially-trained officers who used in-depth regression techniques in an effort to solve the long-running missing person case.
The regression technique officers have previously spoken to Ben's mum Kerry, her parents Eddie and Christine and brother Stephen, who were on the Greek island of Kos when the toddler, aged 21 months, disappeared on July 24 1991.
Two days of questioning with South Yorkshire officers were conducted under caution at a station in another force area.
During the specialist questioning Simon described his own childhood, the days and months leading up to the disappearance, and the aftermath of the investigation. He was also granted access to police records of the case covering 22 years.
Simon told the Mirror: "The senior investigator will now try and piece all the information together. "This was purely my side of events, and there was so much I had forgotten."
The interviews confirmed he left Kos two days before Ben vanished. He flew to Sheffield to wait for his son's return.
Simon added: "I just want the answers after all this time. Obviously it was emotional, and upsetting to go back there again.
"As an adult looking back, you get a different perspective of what you went through."
Simon said he has been given a boost by the cases of , Gina DeJesus and Michelle Knight, who were found alive in Ohio after 10 years.
He added: "The recent case in America gave me hope – it shows that missing persons can turn up. "Those women were just streets away from where they had disappeared."