Police have renewed their appeal for leads in the murder of a convicted paedophile who was hacked to death in a suspected vigilante attack.

Father-of-five, Andrew Cunningham, 52, was found surrounded by a pool of blood with his genitals mutilated in his caravan parked at the Windmill Business Centre, Riverside Road, Earlsfield, on December 9, 2008.

An inquest at Westminster Coroner’s Court in November 2012 heard the convicted paedophile had been entertaining teenage girls in his caravan the evening before he was murdered.

The court heard police had been unable to find his killers, despite interviewing 800 people and offering a reward of £20,000.

Mr Cunningham's naked body was found the next day by his boss, who grew concerned when he did not show up for work at his haulage firm at 7am.

A post mortem examination revealed he had died as a result of stab wounds to his head, neck and chest. He had also suffered horrific injuries to his genitals.

Officers are hoping that six years on anyone with information may now be in a position to come forward and assist with the investigation.

Detective Inspector Alison Hepworth, of the Met’s Homicide and Major Crime Command (HMCC), said: "Andrew Cunningham suffered an extremely violent death and we continue to appeal for any information which may lead to the arrest of those responsible.

"A long time has passed since his murder and allegiances clearly change over time. Someone who felt they couldn’t have spoken out immediately after the murder may now be able to provide some crucial information.

"We know that there was no sign of a break-in to Andrew’s caravan and we still believe that his killer or killers were known to him.

"It was widely known that Andrew had previously been on the sex offenders register for an offence he committed in 2000, however, in the six years since his murder we have carried out an exhaustive investigation which has brought us no closer to discovering a motive.

"Andrew was the victim of a sadistic killing and it is still imperative that we solve this horrendous case."

Anyone who has information is asked to contact the Incident Room at Sutton on 020 8721 4005. To remain anonymous, call Crimestoppers on 0800 555 111.