Susan Barlow turns up unannounced with boyfriend Duncan Craig who she is on a cycling holiday with. Ken is delighted to see them but is shocked that they're holidaying together. Rita is annoyed that the radiators are old - she accuses Len of palming her off with rubbish. Renee dresses up as a man for the barber-shop quartet contest. Rita is pleased when Len finishes the central heating. Tony Hayes complains about Renee being in the quartet but backs down when Ivy threatens a female boycott on the Flying Horse. Fred has to admit that the Flying Horse quartet are better singers and buys their team drinks as a prize. Emily organises a party for Mavis' birthday. Rita is delighted to walk into a warm house. Ken makes Susan and Duncan sleep in separate rooms. Albert tells Ken he can't allow Susan to go on holiday with Duncan as he's nineteen and she's only sixteen.