By now, it might be that you've simply had enough of politics. It would be understandable given the length of the election campaign. But if you can find room for one more political wafer-thin mint, this James Graham play starring Catherine Tate, Mark Gatiss and Nina Sosanya almost certainly deserves a look. First broadcast live from the Donmar Warehouse on election night and covering - both temporally and thematically - the last hour-and-a-half before polls closes, it's a neat idea but one that may end up getting slightly lost in the hubbub of the day. If you were too busy exercising your democratic right to sit down and watch a play about other people doing the same, here's another chance.

There exists a comedians' in-joke, only very slightly up its own jacksie, in which one asks: "What's the secret of good com..." only to have the second interrupt with the shout: "Timing!" But that is, indeed, the very singular secret of comedy, timing, and W1A, in its second outing, gets it just-so, in the same way that there is only one just-so way in which to shoot cuffs, tap dance slowly, play Chopin or excise a pineocytoma.

Writer and director John Morton has, admittedly, the best of sublime comedy talent to work with. Hugh Bonneville, Nina Sosanya, Jessica Hynes, Jason Watkins. But he has, in this crammed hour, not only to re-thumbnail the personalities with a wizard's thumb but get the timing beyond reproach. To this end, the entire cast are apparently "invited" to spend up to seven hours rehearsing 10 seconds of rapid-fire dialogue. I'm sure the above four could improvise delightfully - been lucky enough to meet two of them, one over drinks after a funeral, another over an extremely fun lunch, and what different people they are, thus what fine actors - but the Morton gene calls for just-so, and the BBC, bravely risking much to rip the ferret out of itself in this wince-out-loud comedy, acceded, in what may well become its finest confection since Fawlty Towers.

Thus, for instance, the five just-so bollards. In more minor hands, the sequence in which the black Range Rover of HRH, an (unseen) Charles, is stymied at the entrance to New Broadcasting House, inside which the welcoming committee have become hogtied by their own insane security protocols, could have been simple farce. The anti-terrorist bollards would just have jumped up and down or spiked Charlie's RR in the sump. Instead, Dave (Andrew Brooke), head of Beeb security, aided only by a ridiculous smartphone and the meaningless catchphrase "we are status-active", manages with a stoic glower to "relent" bollards 2 and 4. And then, in quiet desperation, Nos 1, 3 and 5. There is a full nine-second pause. All bollards down. Then bollard 3 reappears, like a giant erection (as if there's any other kind).

There is glorious timing here, yes, but there's also humanity. Was I alone in quietly cheering whip-smart Lucy (Sosanya) in being the first to make it to the royal meet-and-greet, having left the three witches trapped in their own personalities and also a non-revolving revolving door? Or in feeling, admittedly slightly, a twitch sorry for Will, the good-looking, charming intern with the kind of shoe-size IQ even a mother would struggle to love? If you didn't see it, I just feel for you. Do so. David Tennant's perky voiceovers, dry as sandblasted Ryvita, are worth the licence fee alone.

'Last Tango in Halifax' interview: Nina Sosanya

Last Tango in Halifax star Nina Sosanya chats about the shocking events of tonight's episode.

Why I killed off lesbian character

Sally Wainwright explains her decision to kill off Kate McKenzie-Dawson, played by Nina Sosanya.

Last Tango in Halifax began it's third series late last year and reunited us with Alan (Derek Jacobi) and Celia (Anne Reid) as well as their respective broods. I've been a fan of Last Tango since it first began and particularly liked the darker second series which explored the past of Gillian (Nicola Walker) in a lot more detail. With Last Tango's writer Sally Wainwright busying herself with Happy Valley in 2014, I felt that she may not have enough time to wholly devote herself to a third series of this excellent family drama. These fears were compounded by the major story running throughout the first episode in which it was revealed that Alan had a secret son, Gary (Rupert Graves), who was the result of a brief affair Alan had conducted. The introduction of Gary to me felt like a way of just putting another obstacle in the way of the drama's central couple's happiness. However, after a lacklustre opener, Last Tango really kicked in in episode two as the emotional fallout from Gary's arrival started to take its toll on Celia. Celia's realisation that Alan wasn't completely perfect left her reeling and as a result she decided not to attend the wedding of her daughter Caroline (Sarah Lancashire) and her partner Kate (Nina Sosanya). This second episode completely restored my faith in Wainwright's storytelling abilities and it's clear that she knows her characters inside out, a fact witnessed by the icy way Caroline ejected Alan from her wedding.

Indeed, as somebody who has watched the series since it first started, I feel like I know these characters and therefore their reactions feel utterly genuine. That's possibly why I initially rejected the introduction of Gary into the series, however episode two gave Rupert Graves the opportunity to flesh out the character a little more. But Last Tango in Halifax wouldn't be nearly as good as it is if it were not for the drama's four central performers. Last series I found that both Derek Jacobi and Anne Reid had taken somewhat of a backseat to their younger counterparts, however the opening episodes of series three have really put them back in the spotlight. Reid has been particularly good in bringing out the pricklier aspects of Celia's character and in particular her truly feelings about Caroline's sexuality. One of Reid's strengths is her ability to convey her emotions through a couple of facial expressions that allow the audience to know exactly what she's thinking. Though she's not been as prominent a presence as she was in series two, Nicola Walker has still been magnificent and showed a skill for comic timing during a particularly memorable scene in episode two. But so far this series has belonged to the excellent Sarah Lancashire who, as Caroline, has presented her frustration with Celia in a believable manner. Lancashire portrays Caroline as a formidable yet vulnerable woman whose cool exterior has started to melt thanks to her relationship with Kate. Ultimately, after a shaky start, it's great to have our Yorkshire friends back with us for a third series of Last Tango. Whilst I hope that Wainwright finds a way to reunite the characters once again, I feel that the actors are doing a great job of telling the writer's brilliantly constructed story and I for one hope the series runs and runs.

Radio Times review

There's a lovely opening to the third series of Sally Wainwright's warm, spiky drama as Alan tells Celia a funny shaggy-dog story over their Valentine's Day meal.

It's so typical of Wainwright, who has such a wonderful eye and ear for the little moments in relationships, the daft jokes and the shared humour. You'll be glad that she and Last Tango are back.

Alan and Celia (Derek Jacobi and Anne Reid) are settling into married life. But this story has never been just about them. Celia's daughter Caroline (Bafta-winner Sarah Lancashire) is settling into life with her beloved, pregnant Kate (Nina Sosanya). And Gillian (Nicola Walker), once so unhappy in that grim farm on the moor, has a date with a handsome man (played by Rupert Graves).

It's simply good to see everyone again, even though we know that this will never be, thank heavens, a story full of hearts and flowers. There are thorns, too.

Last Tango in Halifax interview: Nina Sosanya

Nina Sosanya (Teachers, Cape Wrath) is back as Kate in the new season of Last Tango in Halifax next week.

By the end of the episode you'll probably be so overwhelmed by some big poignant moments involving Derek Jacobi that you'll have to be helped up the stairs to bed. Make sure there's someone to plump your pillows and take care of you, you're going to need it, as Alan (Jacobi) comes to terms with loss. Jacobi is so heartbreakingly good it's hard not to stand back, nod sagely and say to yourself, yep, that's acting, proper acting, all while you're having a good old cry.

Absence is very much a theme as Caroline (Sarah Lancashire) embarks on her weekend with girlfriend Kate (Nina Sosanya), a mini-break that proves unexpectedly lonely when Caroline has a failure of nerve. They meet the old friend who Kate wants to sire her child, and he's a self-centred, garrulous bore.

Too many people give too much away in Sally Wainwright's masterly drama, as Last Tango in Halifax takes some very dark turns. Emotional scabs that have never healed are ripped away by unwitting hands and the families at the heart of the drama pulse with the pain of open wounds. Celia (Anne Reid) inadvertently, though very thoughtlessly (and typically, as Reid told RT recently, because Celia is not a very nice woman), throws light on a bleak corner in the grim farm on the hill that illuminates a past sadness.

Soon relationships start to sunder under the pressure of exposed secrets and long-buried lies. Even that absolutely gorgeous house in Harrogate (oh, that kitchen! Those gardens!) is quietly starting to foment when it appears that lovers Caroline and Kate (Sarah Lancashire and Nina Sosanya) might want very different things, and a moment of tenderness sparks a crisis.

For its new sitcom about indie radio DJs, ITV2 has poached some top C4 talent: Chris O'Dowd from The IT Crowd, Star Stories' Kevin Bishop and, er, Nathan Barley's Nina Sosanya. There's an enormous amount of self-conscious special guestery - first scene includes Justin Hawkins (from The Darkness) and suddenly it's 'The Guillemots are ready to record'. There are a some good moments - Chris O'Dowd comfortably slips into playing the same hapless role as The IT Crowd's Roy and Kevin Bishop's former boyband 2s Up is well observed. As a first episode they're allowed some room to set up the characters but it will need more jokes in future. Also, the swearing is all wrong.