Another positive sign is the improved state of their talismanic singer, Ozzy Osbourne. As revealed in a recent film made by his son, Jack, Osbourne was in freefall for years after he was ejected from the band in 1978 – even during the making of the early-Noughties reality TV series, The Osbournes. He wasn’t making too much sense at the press conference, but in the movie, he talks lucidly.