By the end of 1973, Deep Purple Mk2 was no more. Ian Gillan had been replaced by David Coverdale on vocals whilst Roger Glover had been replaced by Glenn Hughes on bass and vocals. It left the nucleus of Ritchie Blackmore, Jon Lord and Ian Paice to take Deep Purple in a new direction, which eventually came to a halt with the Mk4 line-up in 1976. With Deep Purple In Rock (1970), Fireball (1971), Machine Head (1972) and Who Do We Think We Are (1973) to Mk2’s credit, many fans lived in hope that one day, the band would get back together — with the music press occasionally courting the odd...