Brace for yuletide suburban chaos courtesy of Lee and Lucy as Lee throws everything at creating the perfect family Christmas, agreeing to Lucy's wishes to do something charitable and having "a normal Christmas where nothing goes wrong." This moment of festive spirit sees the couple invite Wilfred, a lonely pensioner from the nearby care home, to join them for Christmas dinner. The only instruction is that Wilfred is not, under any circumstances, allowed to drink alcohol…

Given best friends Toby and uptight ice-queen Anna are on hand, as well as Lucy's lovely mum Wendy with curmudgeonly dad Geoffrey, surely Lee can ensure this Christmas runs to plan?

When Lee goes to watch Benji playing football for a local Under 13 team, he is unable to restrain himself on the touchline and becomes the competitive dad that all the other parents avoid. Undaunted by the disapproval of Toby, who coaches the team, Lee sets about rigging the vote for the Player of the Year.

Lucy has cooked a special meal so that she and Lee can spend an evening in without distractions, talking about the state of their marriage. But Lee is obsessed with a beeping noise in the house that he can't find and the food is soon forgotten.

It is Lucy's birthday. To celebrate, Geoffrey and Wendy take Lee, Lucy, Toby and Anna for a trip on a vintage steam train. But Lee decides to play Poirot when a stranger turns up unannounced in their carriage and Lucy's special day is ruined.

Lee wakes up inside a coffin and can't remember how he got there, until a phone call from Lucy reminds him what he'd been doing that afternoon. Now all he needs to do is keep Lucy in the dark as to his exact location and work out how to escape.

To take advantage of three free tickets to Adventure Canyon Theme Park Lee takes Mollie out of school for a day and gets into trouble from the new head teacher, Miss Anstis. Now all he has to do is think of an excuse to justify Mollie's absence and what could be simpler than a trip to the dentist?

Lee's lifestyle catches up on him and he is forced to wait on a hospital ward for routine surgery on his gallbladder until his blood pressure comes down. But visits from the parents-in-law and Anna and Toby, who arrive to ask him a question he doesn't want to hear, ensure that his stress levels remain dangerously high.

When Lee and Lucy are asked to cover for Anna on more than one occasion, so that she can go out at night and have secret Italian lessons, they suspect the worst – that she is having an affair. Lee decides that it is up to him to tell Toby that his marriage is in jeopardy and sets about finding the evidence.