Sex Pistols frontman John Lydon has hit out at a contract at the centre of a legal dispute between him and his ex-bandmates, likening it to “slavery”.Lydon, best known as Johnny Rotten, is currently being sued by former bandmates Paul Cook and Steve Jones so that the group’s iconic back catalogue can be used in Pistol, Danny Boyle’s upcoming TV show about the band’s trailblazing history.Cook and Jones have said a band member agreement (BMA) was formed in 1998 to enable licensing decisions to be