A secret police crime museum with Jack the Ripper artefacts and execution death masks could provide Kingston with 1,715 extra front line police hours, if it were opened to the public.

The 150-year-old Black Museum is not currently open to visitors, but a report has suggested it could be a money spinner.

The History’s Life Sentence report by the Greater London Authority Conservatives has worked out that if Scotland Yard’s secret memorabilia haunt were to go public for just three months, it could attract up to 300,000 museum-goers.

At £15 per head, this could pay for 54,900 extra policing hours throughout the capital, including Kingston.

London Assembly member Tony Arbour said it was a “no brainer” the Metropolitan Police should benefit from opening its doors with budgets already so tight.

He said: “Exhibits such as letters from Jack the Ripper will likely prove enormously popular with residents and visitors to the city, who already demonstrate a fascination with the more macabre chapters of London’s history.

“Many of the exhibits showcase the impressive work undertaken by the Met in some of the capital’s most high profile investigations. “This has the potential to fund more police on the streets in Richmond and Kingston.”

Among the creep criminology artefacts is also evidence from the prosecution of Britain’s Great Train Robbery and even the pots and pans used by serial killer Dennis Nilsen, who boiled the flesh of his victims.

The Metropolitan Police were not available for comment.