For a show based on sarcastic back-chat, this last-ever episode turns the tables with a Disney-style finale. Karen's even offering tea and biscuits when dodgy Auntie Angela (Samantha Bond) turns up with her latest toy boy. But how will Spartacus: The Musical go for Ben? And what about the search for Tommy the hamster? Claire Skinner, Hugh Dennis and the kids - Tyger Drew-Honey, Daniel Roche, Ramona Marquez - make a surprisingly sentimental exit.

We've been dreading this day, the day when we finally have to cut the apron strings and let go of the kids from Outnumbered. Sorry, we thought we'd be able to stay strong but it's just too... *dabs eyes with hankie*

Yes, after five series, the show's child stars Tyger Drew-Honey (Jake), Daniel Roche (Ben) and Ramona Marquez (Karen) are starting to dwarf their on-screen parents Hugh Dennis and Claire Skinner, meaning it's time to bring the beloved BBC sitcom to an end. In this final episode, Auntie Angela (Samantha Bond) returns to show off her latest toy boy, there's a cringeworthy performance of the school play, Spartacus: The Musical, and, most shockingly of all, there are signs that the Brockman kids might actually have turned out... alright?!

Video: Dirty Rotten Scoundrels interview

We sat down with Robert Lindsay and Rufus Hound, Samantha Bond and John Marquez to talk to them about their new musical.

"She just likes working so if someone offers her a job, she takes it. She's crazy," says Geoffrey Palmer affectionately in an attempt to explain why Dame Judi Dench has had so many disparate roles during her lengthy career. Having started out as a Shakespearean actor, she cornered the market in gritty TV drama before becoming the queen of middle-class British sitcoms.

Then Hollywood caught up and cast her as M in the Bond films, since when she's played Queen Victoria, Elizabeth I and Iris Murdoch, among others. Her peers, including Simon Callow and Samantha Bond all talk fondly, telling stories of her mischievous side, illustrated by the occasional outtake that'll bring a smile. "You always wanted to be in Judi's gang because they had the most fun," says As Time Goes By's Philip Bretherton. And you can absolutely see why.

Tonight in the semi-improvised family sitcom, another guest arrives to stay, just as the Brockmans are trying to get rid of Auntie Angela (Samantha Bond). Mother Sue (Claire Skinner) has to make a decision about the girlfriend of eldest son Jake (Tyger Drew-Honey). Meanwhile, stars of the show Ben and Karen (Daniel Roche and Ramona Marquez) discuss dreams, the Mafia and trampolining bears. As one does. This is the last in the series but fans shouldn't despair - the Brockmans will be back for a Christmas special.

Screened a day early to accommodate Strictly Come Dancing's launch tomorrow, tonight's episode centres on Sue's tiresome sister Angela (Samantha Bond), who raises Sue and Pete's ire when they discover she has criticised them in a book. Angela's line in self-indulgent mumbo-jumbo makes her more of a cliché than other characters, so the laugh count tonight is lower. But Karen's (Ramona Marquez) dismissal of a cold caller at the front door is both brutal and very funny.

The fifth episode of the third series of the family comedy maintains the good form of last week's, fuelled by an early confrontation between Pete (Hugh Dennis) and Sue (Claire Skinner) and the typhoon-like arrival of Sue's sister Auntie Angela (Samantha Bond) and her ghastly American psychologist of a husband, Brick (Douglas Hodge). That's before an awkward restaurant meal dredges up Angela and Sue's acrimonious history. As usual, daughter Karen (Ramona Marquez) has her own opinion on the matter, deftly using her ingénue quips to throw a cold light on adult hypocrisy.

This is one of the funniest episodes to date. Last week, you may remember, Dad (Hugh Dennis) had woken up with a crippling hangover after a night out that involved green cocktails. It gets worse. It turns out that he danced with a woman called Mimi who kissed him - and he kissed her back - and now his wife (Claire Skinner) has found out. One way and another it could hardly be a worse time for the unspeakable sister (Samantha Bond) to arrive for a visit with her new boyfriend, an American therapist with a ponytail called Brick (Douglas Hodge). They all go out for a meal and the evening degenerates into a classic middle-class bloodbath, during which little Karen (Ramona Marquez) dissects the ponytail's psychobabble with lethal precision.

Pete has disgraced himself. In a moment of drunken folly he has brought shame on himself, on Sue and possibly on the whole family. As you'd expect, the scene tonight where Sue confronts him about it is one of the best in the series so far. Claire Skinner does simmering rage better than most - just look at the way her eyes shoot daggers at Pete. And look, too, at the way Hugh Dennis saves Pete's most panicky look for when he realises he'll have to discuss the whole thing with 13-year-old Jake. This little contretemps serves as backdrop for the return of one of Outnumbered's old hands - Samantha Bond as Sue's infuriating sister Angela. Since we last saw her, Angela has married a pony-tailed American therapist (Douglas Hodge) and become mother to his children: "We have five kids," she announces to Sue, with classic sisterly oneupwomanship. The comedy in the awkward restaurant meal that follows is a teeny bit forced, but there are plenty of choice moments in the episode. As Angela says, annoyingly, "There's such wonderful energy in a big family."

The family-centred improv' comedy has been a bit patchy of late but this episode is a corker. Tonight it's not just the kids who have been misbehaving, as Sue (Claire Skinner) discovers when she checks Pete's (Hugh Dennis) mobile for messages. But there's no time for a heart-to-heart when the kids are about.

If it's not Jake (Tyger Drew-Honey) turning the garden into a watery war zone, it's Karen (Ramona Marquez) asking if it's ever OK to hit a classmate.

Meanwhile, Pete's worried about the impending clash as Sue's sister Angela (Samantha Bond) turns up with her new husband (Douglas Hodge). While the adults struggle to remain civil, the children call a spade a spade - or, in Jake's case, reel off 18 names for a part of the male anatomy. Nudity and toilet habits also feature - but that's kids for you.

Indeed, some families might see this comedy more as a documentary. A funny one, mind.