Professional Ethics is the 1013th episode of The Bill D.S. Greig and D.C. Lines investigate graffiti attacks on motor vehicles and uncover a fraud. John Bowler, who plays Parker, would later join the cast as P.C. Roger Valentine. Retrieved from "https://thebill.fandom.com/wiki/Episode:Professional_Ethics?oldid=24310" Categories: 1996 Episodes Series 12 Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.