This week we take a deeper look at the new feature-length documentary about three of the game's greatest ever managers who shaped the future of some of the world's most iconic clubs - Stein, Shankly and Busby. The film's creator, Jonny Owen chats with Si about the background of the film and provides an insight into the story of three men from Scotland who would go on to change the face of European football forever.   See acast.com/privacy for privacy and opt-out information.