An eventful night out is had by all, as Janey and Susan go to a hen night, and Roger goes on a blind date, and Ben, who should be at home looking after Kenzo, spends more time out than he bargained for.
Susan wants to look her best for an impending school reunion. When she is asked to give the keynote address, however, she decides that her best may need some help. Unfortunately, Ben is on hand to administer the Cavitox.
At Susan's mother's funeral, Arthur, the father who abandoned the family thirty years earlier, turns up and takes such a dislike to Ben he offers his daughter a million pounds to divorce him. Is she able to refuse such a generous offer?
Ben and Susan go off to a couples' retreat for a weekend - at which they prove to be less than ideal guests - leaving Janey and Michael vying for the affections of Michael's new boyfriend. However, the triangle proves to be more Bermuda than eternal.
Ben and Susan have yet another row after he refuses to attend her godparents' anniversary party so they decide on a trial separation, taking it in turns to live in the house alone. Ben moves in with Roger, ruining his love life whilst Susan overstays her welcome with Michael and his partner.
Janey and Michael give their parents a Spanish holiday as an anniversary present but Michael has used Ben's credit card to finance it and needs to replace the money quickly so he contacts "Cash In the Attic", finding that the only sale worth a four figure sum is Susan's beloved antique clock.
Ben Harper is a moderately successful family man and dentist. He is also undergoing a mid-life crisis and trying to cope with the bizarre reality of raising teenage children. His wife Susan seems quite happy, enjoys her job as a London tour guide, however at home her ability to find her way around a cookbook or pantry is less successful. Their three children Nick, Janey, and Michael are as different as chalk and cheese. Nick (19) is on his gap year, but doesn't get much further than the sofa or job centre, Janey is as sharp as a tack and 16 going on 25, while Michael is a very bright, computer-nerdish 12 year old who is just discovering girls.