Fabled British prog-rock band Steel Mill was formed in Wandsworth, a working-class district of south London, during the late 1960s, after singer / keyboardist David Morris began working with saxophonist / flautist John Challenger, who had played with a folk group - The Garret Singers - the initial Mill line-up completed once they were joined by former Roadrunners' drummer Colin Short, Derek Chandler on bass and Terry Williams on guitar. The nascent band rehearsed for about one year, playing very…