A previously unseen Michael Jackson documentary could make more than £4 million when it goes up for auction later this month.

The backstage footage from the King of Pop's 1992/1993 'Dangerous World Tour' was recorded by a documentary crew but Michael was reportedly so unhappy with the end product he fired the filmmakers and gave the only existing copy to an unnamed driver, who has now put it up for sale.

The chauffeur - who claims Michael gave him the film as a "reward or a bonus" for his "transportation services" - kept the tape a secret until the star's death from an overdose of Propofol in June 2009 when he posted a brief clip on YouTube.

Although Michael's record label and lawyers tried to claim exclusive rights to the documentary, a judge ruled in favour of the driver saying it was a gift although it was ruled that he could not make copies.

The two-hour documentary is set to be of huge interest because it features behind-the-scenes images and contains footage of Jordy Chandler, who accused Michael of child abuse before he and his parents settled out of court.

Ted Owen - CEO of Fame Bureau auctioneers, who will be responsible for selling the footage - said: "I'm very excited that this tape is finally going to be seen because of its quality, the amount of cameras used and the sheer closeness you are to the performance when watching it."

Meanwhile, the estate of the late singer has given Queen permission to release previously unheard tracks recorded by Michael and the late Freddie Mercury in the early 80s when the rockers were touring the US.

Guitarist Brian May said: "The Michael Jackson estate are happy for us to go ahead with the music. But it's not something that we can rush.

"I work on things with The View 'to let's see how it goes'. When it is something we feel is worthwhile then it's nice if we could get it out there."