Convict 99(1938):Starring Will Hay and Moore Marriott
A schoolmaster who is a disgrace becomes a victim off mistaken identity and is put in charge of a prison set up to house the toughest criminals in Europe. A disgraced school master, Benjamin Twist, is mistaken for a tough prison governor and assigned the charge of a prison for particularly hardened criminals. Believing he is being sent to a school rather than a prison, he celebrates accordingly only to find that his drunkenness accidently lands him on the wrong side of the prison bars. The Governorship is eventually restored to him, and he sets about popularising himself amongst the convicts by turning a blind eye to their shady dealings.
