aul McCartney is a grandude on a mission. Now 77, he has just finished a tour of North America, is back writing songs and busy turning the film It’s a Wonderful Life into his first Broadway musical. More surprisingly, he has written a bedtime story, Hey, Grandude!, a picture book about a magical grandad who takes his grandchildren on adventures.

After a day’s work in the studio in London, he calls me as he’s driving along the Thames, apologising for the poor reception. “Yeah, this is Paul,” he says, the fuzz on the line like the distortion you get when a whammy bar is placed next to an amplifier. “I hope the signal holds. So let’s get going!” he says.

Why write books for babes…

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