However, in 2019, detectives said there was no proof that Mr Sloley had been harmed and there was no evidence that it was linked to any other cases.
Speaking about the Metropolitan Police’s £10,000 reward, detective chief inspector Sarb Kaur, who is leading the investigation into his disappearance, said: “Alex was reported missing to police on 8 August, 2008.
“Since then, there have been extensive enquiries made by police, but sadly Alex has not yet been found.
“We are now offering a reward of up to £10,000 for anyone who has information relating to Alex’s whereabouts.
“This remains an active missing person investigation, subject to regular review by senior officers, with the aim of locating Alex and bringing some comfort to his family. We have recently met with Alex’s mother to outline how we intend to progress our investigation to find him.
“I would ask anyone with information who could help to please get in contact immediately, no matter how insignificant you think this could be.”