Staff at the SOE training school in Scotland called William Fairbairn and Eric (Bill) Sykes the ‘Angelic twins’ and some students called Fairbairn the ‘Shanghai Basher’ or ‘Dangerous Dan’. The fighting system they developed was sometimes referred to as gutter fighting because there were no rules or so-called gentlemanly conduct.
I recently found this brief documentary on the internet.
Alan Malcher 