Z-Cars - Season 2 Episode 38 Scare
Overview: The crew of a merchant ship about to dock at Seaport are looking forward to shore leave. They have money to burn and an itch to burn it in Rosie's Club. When a smallpox scare leads to all leave being stopped, two sailors have other ideas and sneak ashore. Lynch and Graham have to find them to prevent a possible smallpox epidemic.