Simon and Peter come up with the idea of finding their mum a husband, Sally's not too happy when a randy admirer manages to track her down, and Mr. Campbell agrees to help her by playing the part of a rival suitor.
Questions are asked when Sally's parents decide to visit out of the blue, news that David's mother has a title comes as something of a shock, and Auntie insists that a meeting of the two families needn't be humiliating.
The boys borrow a wedding present when they can't afford to buy one, David insists that his friends won't turn his stag night into an orgy, and Sally causes amusement when she pretends to have a party of her own.
Simon reveals that he's been trying to save enough money to buy a bike, Sally takes on some extra hours so she can surprise him on his birthday, and hiding it proves to be as difficult as getting it home in the first place.
Sally panics when she wakes to the sound of strange voices in the house, Simon and Peter are told to find hobbies when television is banned, and Auntie gets a nasty shock when she tries to spy on a very secret project.
Sally denies that her great mood is because of her handsome new boss, a dinner invitation reveals the truth about a shapely female friend, and Simon and Peter decide to show him that their mum's a bit of a swinger.
Sally worries when she finds dirty magazines hidden in Peter's bedroom, Auntie suggests being open about the issue after reading an article, and David asks about introducing the boys to his daughter during half-term.
Sally worries that the boys will be horrible to David's peculiar daughter, Simon hits it off with her when she turns out to have a filthy mind, and Auntie can see no harm in spending a night at a hotel with a bit of a lad.
Sally falls for Simon's teacher when she confronts him about his report, being invited to an art happening allows her to show her natural talent, and a date at a cocktail bar sees her get far too familiar with Tom Collins.
Sally's utterly horrified when Peter tells her that she's got a wobbly bum, the boys bet her that she won't be able to lose as much weight as Auntie, and things quickly get tough when hunger starts to get the better of her.