Due to a failure in communication back in the 1950s, widowers Alan Buttershaw (Derek Jacobi) and Celia Dawson (Anne Reid) never got the chance to go on their first date. They are reunited 50 years later when their respective grandsons add them on Facebook and they rekindle their relationship over email. The day they meet up again for the first time they decide to get married, much to the initial dismay of their daughters from their respective first marriages, Gillian (Nicola Walker) and Caroline (Sarah Lancashire).
Alan lives with Gillian and her teenage son Raff (Josh Bolt) on their farm near Halifax. He moved in after his son-in-law Eddie died about ten years ago after what was allegedly an accident. Eddie's brother Robbie (Dean Andrews), a copper and bike enthusiast, is still on the scene, taking Raff out for rides and antagonising Gillian. Celia lives with Caroline and her two grandsons, William (Edward Ashley) and Lawrence (Louis Greatorex). Caroline is an Oxford graduate who is the headmistress of Sulgrave Heath, a prestigious public school. Her estranged husband John (Tony Gardner), a washed-up novelist and academic, has turned up at their door after realising that Judith (Ronni Ancona), the woman he left Caroline for, is an alcoholic; Caroline allows him to move back in for the sake of their kids. For the same reason, she also calls off her relationship with Kate (Nina Sosanya), one of the teachers at Sulgrave.
Provides examples of:
- The Alcoholic: Judith. She can't even quit drinking when she's pregnant.
- All Lesbians Want Kids: Kate wants a baby. At 42 and with four previous miscarriages, she doesn't want to waste any time. Caroline is more hesitant on the matter, thinking Kate will only end up being disappointed when it doesn't work out. The storyline does dabble some of this trope's hallmark cliches by having it at least partly focus on the sperm-quest and having Kate opt for insemination via sex, but it does try to rationalise it by having Kate say that that was what was most likely to work when compared with any artificial methods. However, once Kate gets pregnant with the help of her friend Greg, she doesn't feel any particular need to involve him any further. As of the end of Series 2 Kate is still pregnant after a brief scare, and with a third series coming up, it's more likely that the donor aspect will become proportionately less over the life of the whole story.
- Alone Among the Couples: Caroline at Alan and Celia's wedding in the Series 2 finale.
- Bait-and-Switch: When Caroline finds Lawrence crying in his bedroom after John outs her to Celia and Lawrence gets the news from Gillian over the phone, you could be forgiven for thinking that he's going to turn on her and ask her how she could have done something like this to him, but instead he just hugs her and sobs:"I don't want them to be mean to you."
- At first, it seems like Eddie died in a biking accident, but in actual fact, it was murder made to look like suicide by log-splitter.
- Bestiality Is Depraved: Gillian once caught a teenager interfering with one of her stock. The weird thing was that he kept coming back to the same sheep.
- Christmas Episode: The last episode of Series 2 has Alan and Celia's second wedding take place on Christmas Eve.
- Coming-Out Story: Caroline tried to come out to her mum while she was a student, but Celia took it very badly and told her never to tell anyone else, especially Kenneth. One failed marriage and two kids later, she starts up a relationship with Kate. She tells John that she has been seeing "someone", which he is not very gracious about considering he cheated on her with Judith before he walked out. When Caroline clarifies that this someone is not a he, John gets drunk and maliciously outs her to Celia.
- Elaborate University High: Sulgrave Heath, most likely, although we don't see much of the building itself. The script describes it as "very posh and very traditional. Like Christ's Hospital, but in Harrogate."
- Fictional Counterpart: Greenhough's, the supermarket where Gillian works, is a fictional counterpart of The Co-op.
- Good Girls Avoid Abortion: Averted by Gillian when she was 15 and still at school. Played straight with Ellie although when everyone else discusses the matter, the implication seems to be that they would have been in favour of her getting an abortion if she had known she was pregnant earlier on.
- I Regret Nothing: Said lovingly by Alan at Eileen's grave when he posthumously forgives her for not passing on Celia's message after she moved to Sheffield.
- Jerkass: John seems like this most of the time.
- The Last Title: The title of the series.
- My Own Private "I Do": Alan and Celia plan a quick no-frills wedding after Alan's heart attack, thinking that everyone would be pleased for them, but Gillian is heartbroken that her Dad would want to exclude her and Raff from something so important. Harry and Maurice also tell him that they're disappointed that they missed out on the chance to be there as well.
- Nice Guy: William, Caroline's son is the closest there is the in series, being consistently kind and supportive to his mom and brother. Kate, Caroline's girlfriend, and Raff, Gillian's son, also qualify.
- No Accounting for Taste: Having failed to get back in touch with Alan and a subsequent boyfriend taking up with her sister, Celia ended up being thoroughly miserable with her first husband Kenneth, with the two of them only ever speaking to each other if they had to. This had a knock-on effect on Caroline, who admitted that she grew up never knowing how to make a proper relationship happen. It seems that she and John were probably really good friends in the past, but when she tells her mum that she's "too old to pretend", this suggests that their relationship was always a pretence for her on some level. While Caroline probably wasn't as unhappy as her mum was, it's interesting that they both ended up making what is essentially the same mistake.
- No Bisexuals / Ambiguously Bi: John is horrified when he finds out that Caroline has been seeing Kate because he thinks it means that Caroline must have been faking it every time she had sex with him. It doesn't cross his mind that wife might be bisexual and simply met someone new after he left her. To be honest though, the evidence does seem to suggest that Caroline is gay - her dig at John's manuscript may be indirect, but it's as close as she gets to attaching a label to herself. If either of them is bi, it's probably Kate, given that she has had previous relationships with men, such as Greg, her friend from university. She also never says exactly why her marriage to Richard fell apart. It could just as easily been from the strain of her pregnancy troubles as it could have been a consequence of her coming out as gay later in life.
- Oop North: The show is set primarily in Halifax and Harrogate in Yorkshire.
- Red Oni, Blue Oni: Gillian is the passionate and emotional red oni to the repressed and intellectual Caroline's blue oni. They start off strongly disliking each other and end up closer as their parents fall in love.
- Shout-Out: The title of the show is a pun on Last Tango in Paris. Fortunately it doesn't share any other similarities with that film.
- When Caroline reads from John's manuscript, it describes Gillian's thinly-veiled stand-in as having the body of a 16-year-old boy, leading Caroline to joke that she's not the only gay in the village.
- Spot of Tea: The kettle's never off for long no matter what's happening.
- The Simple Life Is Simple: Gillian farms sheep for a living, but it's particularly hard-going in the winter and she works part-time at the local supermarket to make ends meet.
- Your Cheating Heart: Kenneth cheated on Celia constantly throughout their marriage, which in turn leads Celia to wonder if her son-in-law had been carrying on behind her daughter's back long before any of them found out about Judith.