The couple, both followers of the Jewish spiritual movement, approached Downing Street, Whitehall and British Nuclear Fuels (BNFL) promoting a “mystical” liquid tested in a Ukrainian lake.

“It was like a crank call . . . the scientific mechanisms and principles were just bollocks, basically,” one official said.

But civil servants at the Department of Trade and Industry (DTI) and scientists at BNFL were obliged to take the celebrity couple seriously.

It is understood that the couple, who live in London and Wiltshire, were promoting a water-based solution that had allegedly proved successful in neutralising dangerous nuclear waste in Ukraine.

The Kabbalah Centre, which is based in California, believes water is a uniquely important substance that can be given magic healing powers through “meditations and the consciousness of sharing”.

Madonna is said to have approached Downing Street, before being directed to the DTI. “She relentlessly pursued people,” said a former DTI civil servant. “She wanted to get this Russian scientist to explain this to civil servants.”

But her campaign became bogged down by Whitehall bureaucracy. “It was a case of pass the parcel,” said the civil servant.

Ritchie, the film director, cold-called BNFL and wrote a series of letters accompanied by scientific papers. A panel of BNFL’s best scientists was tasked with looking into the proposal but could find no scientific basis for the claims.

The lobbying, which took place a few years ago, was part of a campaign by Madonna, who saw it as her mission to rid the world of nuclear waste. She made this clear in newspaper interviews at the time.

“I mean, one of the biggest problems that exists right now in the world is nuclear waste,” she said. “That’s something I’ve been involved with for a while with a group of scientists — finding a way to neutralise radiation, believe it or not.”

The Kabbalah Centre, which is based in Los Angeles but has branches worldwide, was set up by Philip Berg, a former insurance salesman. One devotee has described how Berg leads chants of “Chernobyl” and the names of other nuclear power plants. Followers believe this helps “heal the problem of nuclear waste”.

Undercover reporters who attended a Kabbalah Centre dinner in London described how Madonna and Ritchie were among guests who turned east towards Chernobyl and began shouting its name.

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