Question: Roy "Pretty Boy" Shaw and Lenny "The Guv'nor" McLean were arch-rivals in what?
Sentence (from "Lenny McLean"): Leonard John McLean (9 April 1949 – 28 July 1998), also known as "The Guv'nor," was an English boxer, bouncer, criminal and prisoner, author, businessman, bodyguard, enforcer, weightlifter, television presenter and actor, and has been referred to as "the hardest man in Britain".
Relevant evidence: Yes