Yep, I read (but can’t remember where so could be rubbish but I thought it was true) that they were told on the day of performance that Billie could not sing it live because of the lyrics. There was a real row, went on for hours, but in the end they agreed to have the band play live and Billie lipsync because it was for Amnesty, otherwise they would have dropped out. Supposedly the whole band were very unhappy, took it as a slight on their professionalism that Billie would not sing the naughty words!