David Bowie doesn't actually take part in David Bowie and the Story of Ziggy Stardust (BBC4), an excellent documentary about the making of the album, and the birth of the alter ego that catapulted him from just an androgynous 1970s oddball to unearthly android and icon, the biggest – and most important thing – in British pop since the Beatles. It would be out of character, and take some of the mystery away, for him to appear as a talking head in a TV documentary, albeit one about himself. Some of the Ziggy stuff, old interviews in which Bowie claims his mind was taken over by his own creation, now seems a little ridiculous in the get-real, down-to-earth 21st century. Yeah shut up, mate, you're from south London, not from bloody space. He doesn't even come over as a particularly nice person: very self-possessed and narcissistic. But perhaps you have to be, to be a genius. And God, it still sounds good, doesn't it?