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And yet, as the band's only official biographer Hunter Davies told Radio 4's Today programme on Wednesday: "The strange thing about the Beatles is that the longer we get from them, the bigger they become".

"Philip had a rather tragic and lonely childhood," said historian and Philip's biographer Prof Angela John, who acted as an informal consultant on the film.

But friends and biographers close to the Pope have insisted he has no plans to step down.

But his friends and biographers have insisted he has no plans to step down.

At one point, his biographer recalls, Musk showed up at a studio while she was recording with a gun and demanded to be included.