Guess Who's Coming to Pinner?

Arthur is invited to the funeral of big-time gangster Charlie Johnson and the wake afterwards. The funeral is being carefully observed by police and the palatial Johnson home in Pinner is bugged. Police identify Tommy Hambury, a major crook returned after many years abroad and conclude that something major is being planned. Ray starts romancing Joanna, a friend of the family, who is later revealed to be an undercover police officer.