Builder was the episode that was pulled from early on in the series and shown at a later date.
Steve Oram plays a builder who arouses suspicion. The same Steve Oram who played a builder who aroused suspicion in an earlier episode of Ghost, the comedy series broadcast immediately before Not Going Out. Steve Oram needs to cease playing builders.
Lucy has moved out for a few days while the kitchen is redesigned. Lee is supposed to project manage it but the builder is a lazybones who sits there reading the paper and having tea.
Lee turns to Anna to pretend being Lee's wife. She scares the builder away. Now it is left to Lee and Toby to finish the kitchen off.
Anyone who ever has had a kitchen makeover will sympathise with Lee.