Police have insisted the investigation into the disappearance of Suzy Lamplugh remains ongoing 35 years after she vanished.
Estate agent Miss Lamplugh was declared dead, presumed murdered, after going missing in July 1986 at the age of 25.
She left her west London offices to meet a mystery client known only as “Mr Kipper” for a flat viewing and was never seen again.
Her car, a white Ford Fiesta, was found abandoned in Stevenage Road, Fulham, and police believe she was abducted and murdered.
Investigators most recently carried out searches at a property in Sutton Coldfield, West Midlands, in 2018 and on land near Drakes Broughton in Worcestershire in 2019, but nothing was found.
On Monday, ahead of the airing of a new Sky television documentary about the case, the Metropolitan Police said detectives remain committed to the investigation.
Detective Chief Inspector Rebecca Reeves, the senior investigating officer, said: “We would urge anyone who believes they might know something about what happened to Suzy all those years ago to come forward.
“Whether you saw something that you thought was unconnected at the time or you felt under pressure to protect someone you knew – it is not too late.
“The passage of time has not weakened our determination to seek justice and get the answers that the Lamplugh family continue to wait for.
“They have always been supportive of our efforts to make progress in the investigation and they have shown remarkable strength despite the immense sadness they have endured over the years.”
In 2002, police named John Cannan, who was jailed for life in 1989 for the rape and murder of Bristol newly-wed Shirley Banks, as their prime suspect.
He has been questioned several times but has always denied any involvement in Miss Lamplugh’s killing.
Anyone with information can call the Met Police specialist casework team on 020 7230 4294, or to remain anonymous contact Crimestoppers on 0800 555 111 or online.