Ben is quick to point out that the Harpers have had some of the worst Christmases ever, and the family are reminded of some of their Christmas disasters. When Roger finally does pop the question, Abi faints. When the case goes to court Ben defends her and tries to persuade the Court that the stealing was a result of the menopause. This episode is a clip show celebrating the 100th episode of the series. Also, Stupid Brian tries to win Janey back, and Ben has dental assistant problems. They then have to reassure their younger son Michael that they are not going to. His interest in Uncle Nick leads to Janey and Michael sharing their personal experiences with him but what exactly can Alfie add to the discussion? The following day Ben drives him to his interview, and on the way buys Michael his first pint, which results in him throwing up all over the professor.
Janey comes downstairs to take Brian up to bed. When Whitten's son comes into the surgery, Ben assumes he is Toby, until he tells Ben that he is Toby's brother James. Ben jokingly claims she isn't that old, which annoys Susan. Meanwhile, Abi is being mistreated by her boyfriend as he is making her clean his house and clean out the drains. Susan stays at her house, while Ben seeks solace in Roger, who's expecting a woman around.
Inevitably, when Ben gets it home it is the wrong colour. Ben finds a £1200 ring which he thinks is for him from Susan, but is actually from Grace to her toyboy , so he goes out and buys Susan a £1200 first edition of Mrs Dalloway. It's not long before Ben tells Susan about Janey's new romance. Ben soon discovers that his wife Susan has had work done on her teeth by Mel, causing them to argue. However, Mr Channing , from the company tells Ben he believes it is a scam and Ben then tries to catch Mr Casey out. . Ben is more than a little jealous, despite Susan's assurances that it's purely a professional relationship.
Meanwhile, Janey and Michael use the project as a way of getting at each other whilst Kenzo becomes the definition of bored. Janey soon takes a liking to the new guest and the pair of them go on a date, much to Ben's dismay, Susan then discovers the truth and it transpires that his brief fling happened when he and Susan were dating. Meanwhile, Michael's latest scam involves the aid of everyone, but will they help him out? Meanwhile, Ben is looking forward to winning a peaceful game of golf with his 90-year-old friend Gerald, but his plans are thrown into chaos when Abi causes him to twist and burn his ankle. It is also Janey's birthday, and her boyfriend Steve dumps her over the phone. However, Susan is confronted by his wife who sits her down and eventually breaks conversation with her. However, Susan soon finds out that the Police are looking for her, and then Susan lies when they turn up at the house, but it turns out the policeman turns out to be an old fling.
Meanwhile, Janey takes care of an annoying elderly patient, which eventually leads to him dying and leaving Janey his flat, and Michael's boyfriend Scott moves into the Harper residence. Meanwhile, when Janey has a different boy round each day, each one coaching in her , Ben accidentally calls her a prostitute. They are even more surprised to learn that the older couple are who want to have with them. Michael's nerves get the better of him when he tells Sean that he is dying, just so he can spend some more time with him. Arriving at the hotel, it seems Ben has brought death on holiday with him, with body bags being taken out of the hotel and then the remains of a crime scene in his bedroom. As their team falls behind in the quiz, Alfie points out that a player on another team has been cheating by texting all night. When Susan attempts to put a stop to the new dentist and Janey he simply flatters her so she returns happy.
But as Ben gets to the truth, he makes a suggestion on how the situation can be resolved. Zelda tells Susan that Ben will die the following Thursday at 9. Meanwhile Abi, who is now engaged to Roger, wants a baby, Janey is having problems getting Kenzo's Christmas present and Alfie makes a special brew which he tells Michael will make them irresistible to women. His first performance is at the , where he gets injured when he launches himself off a ramp and hits a cow and ends up in hospital with a broken arm, leg, three broken ribs and whiplash. When they meet the couple in the dining room, they are surprised to see that they are older than them.
Ben soon gets bored of his new hobby, and assists Susan to set up the exhibition. In the head to head, Alfie beats Michael to win the £3000 prize money. Meanwhile, Roger wins The Times crossword again, so Ben then tries to do the same thing but ends up massively disappointed until the name Harper finally appears in the winners column — the only thing is that Roger's entered his crossword under the name Abi Harper. With Ben away at a conference — and still not having got the hang of texting — Susan throws herself into her work. Thinking Susan has forgotten her bag, Ben goes through it and is shocked to find a hotel room key and a note from James. Meanwhile, Welsh musician Alfie Butts , a friend of Nick's, turns up and Susan insists he stay. When he and the rest of the family go back into the main hall it has been mysteriously decorated and Christmas presents placed on the floor.
After discussing whether to have the baby or not, Susan finds out it was a false alarm, but insists Ben has a vasectomy so it does not happen again. Meanwhile, Michael goes religious with a new friend called Hubert Alex Dawson and Abi gets involved in naturism thanks to Ben's misguided advice and the fact that he held back information for his own amusement. Will they get back together, or will everyones' lives be ruined by their split? Janey is soon released in return for food, and hours later the police storm the bank and the other hostages are released. Meanwhile, Nick becomes a magician under the name Brian Miles while Susan plays the cello. Susan has to force Roger to tell his mother he does not want to live next to her. What should just be a simple task of turning off the alarm soon turns into and Ben is forced to clamber over furniture and make all sorts of other ridiculous movements just to try to get back to his bedroom without setting off the alarm.
Meanwhile, Abi invites her boyfriend Michael round, and the other Michael tells lies to make sure he leaves, leaving Abi furious. Ben then enjoys his private room, but he is soon sent to a ward, as it is soon discovered that his private health insurance has expired. It is not until she gets to the police station to find out that her old friend, Paul is a drug dealer whom the police have been trying to capture for a while. He's adamant that he will do no such thing, and that he will eat the fruit, vegetables and other food that she's left for him. Also, Janey hurts her neck at the and Alfie gives her an amazing which she then recommends to Abi resulting in a rather jealous Roger.