The political satire continues. Nicola Murray MP (Rebecca Front) needs to find a celebrity to publicise a new "Healthy Choices" campaign. But Steve Fleming, the PM's new fixer (played with diabolical glee by David Haig) has competing priorities, demanding massaged crime figures for an urgent press briefing. When Murray's team bungles both tasks, spin-doctor Malcolm Tucker (Peter Capaldi) is incandescent. Stuck between Tucker and Fleming, Murray can only ask, "Could you two tell me in which order and from which direction I'm going to be shafted?"

Rebecca Front: Claustrophobia isn't rare

"I, like the character I play in The Thick of It, am badly claustrophobic."

With the Prime Minister away at a summit in Spain, splenetic spin doctor Malcolm Tucker (Peter Capaldi) is left holding the fort in the savage political farce. Naturally he's soon driven to blue language and blind fury by minister Nicola Murray (Rebecca Front), who attempts to unveil her hobby horse policy, "The Fourth Sector Initiative" - but in the process inadvertently launches a leadership challenge.

It's been pleasing to see Armando Ianucci's polit-com promoted from BBC Four to BBC Two and reach a wider audience. Tonight, he playfully sets proceedings at another Beeb edifice, Radio 5 Live. After weeks of trading bitter blows in the press, minister Nicola Murray (the fantastic Rebecca Front) locks horns with her shadow live on Richard Bacon's late-night phone-in show. Publicity pit bull Malcolm Tucker (Peter Capaldi) listens in the relative comfort of his office until some breaking news makes life difficult for the hapless politicians. Spin doctors are soon dispatched to the studio for damage limitation - with the usual side order of swearing.

The foul-mouthed misanthrope, which is what writer Armando Ianucci has constructed as a comic monster from an image of Alastair Campbell, former director of communications to Tony Blair, now has a new victim, minister Nicola Murray (Rebecca Front). She has four kids and a businessman husband, is neurotic, desperate for affection and approval, happy to blame everyone else for her mistakes - and is a media disaster waiting for its moment.

Peter Capaldi, who plays spin-doctor Malcolm, is the linchpin here, with his gaunt face - most terrible when smiling - and his conviction that all around him are guilty until their innocence is brought to him on a plate. And his terror, too - which is that of one who understands the ruthlessness of media that no longer care for fairness in their dealings or for policy in their coverage, but, like a piranha shoal, drift here and there until blood is in the water, when they swarm. The Thick of It has a solid base, but Capaldi is its on-screen genius.

More satirical spin doctoring and creative swearing as Armando Iannucci's political sitcom continues to prowl the corridors of power. It's party conference season, meaning that new Secretary of State Nicola Murray (Rebecca Front, a superb addition to the cast this series) is stuck in an Eastbourne hotel room, writing her speech. No matter how many mini-kettlefuls of coffee they make, however, she and her right-hand oaf Ollie (Chris Addison) can't quite nail it. Until, that is, her hapless adviser Glenn (James Smith) wheels in his secret weapon: a tragic local widow.

The new series continues of the fizzing, potty-mouthed political comedy created by Armando Iannucci. A week into her new job as secretary of state for the Department of Social Affairs and Citizenship, Nicola Murray MP (Rebecca Front) sends the government's communications team into a spin. Her department's computer system has wiped the immigration records of 170,672 people, presenting her with two daunting tasks: keeping the fact from the press, and breaking the news to the irascible Tucker (Peter Capaldi). Handling these duties of office, Murray has to sit through lunch with the staff of The Guardian without letting her department's mishap slip.

Nicola Murray is the new Secretary of State for the Department of Social Affairs and Citizenship in The Thick Of It (BBC2, Saturday). Sounds important; it isn't. If she'd said no, the only other candidate was Malcolm Tucker's left bollock with a smiley face drawn on it.

It's really just a job title, not a job, but Nicola doesn't know that yet, and has ideas about things like social mobility. She's like the new girl at school - trying to work out who to make friends with, where to fit in. The other kids - Ollie and Glenn and Terri - circle suspiciously. They sneak on each other, and lie, and gang up.

Then Malcolm, the big playground bully, shows up. He opens his enormous mouth as wide as it will go and vomits out a seemingly never-ending torrent of verbal abuse. If you're reading pre-watershed, or you're a child, you must stop reading right now, because I've put some of Malcolm's bad words in. It's hard not to - they're such a big part of The Thick Of It. "You're a fucking human dart board, and Eric fucking Bristow's on the oche throwing a million darts made of shit right at you," he splutters to Nicola. "Jesus Christ, you're a fucking omni-shambles, that's what you are . . . "

And so it goes. It's filthy, and yet it's so beautifully crafted and so perfectly delivered, it's almost as if Malcolm's actually turned swearing into art. And omni-shambles - isn't that lovely?

Nicola (played by the funny and brilliant Rebecca Front, a welcome addition) has a brave attempt at taking Malcolm on at his own game. She tells him her daughter is on heroin, "although she has cut down since getting pregnant by that Nigerian people smuggler, cos the track marks would have affected her porn career". But it's futile, like taking on Lionel Messi - Lionel fucking Messi - at football. And she ends up sacrificing her daughter's future for Malcom's party line.

I want to work at the Department of Social Affairs and Citizenship. I mean, it's lovely here at the Guardian - looking around, I'm surrounded by intelligent and mostly reasonable people, tapping away on their keyboards. There's some good-natured banter, a few jokes, a bit of gentle back-stabbing. But nothing like what goes on in The Thick Of It. I want the blistering bickering and the bullying, the full-on playground experience, I want to be bollocked by Malcolm Tucker.

It is a brilliant performance by Peter Capaldi, and by Front, by all of them. But the real genius is in the writing. It's so out there and yet totally believable, so polished, so well observed, right down to the smallest details. That Nicola Murray stands in front of a campaign poster for Liam Bentley so that it reads IAM BENT right by her head is funny; that it immediately appears on YouTube is funnier still, and that the YouTube footage is intercut with random bits from Family Guy is best of all. "Why do people fucking do that on YouTube, it's not even funny," says the hapless Nicola. Yes it is. At least she's learning the language.

The movie - In The Loop - was good, but this is better. The Thick Of It works best like this, in short, rude blasts. What's going to happen when the Tories get in, I'm wondering (and worrying). Does The Thick Of It work in opposition?

If the past year has taught us anything it's that politicians are a bunch of selfserving, egotistical incompetents only interested in lining their own pockets. Then again, if you've ever caught an episode of masterly Westminster satire The Thick Of It, that won't have come as any great surprise. It's odd to think that, thus far, there had only been six episodes and two specials plus a movie of Armando Iannucci's lacerating satire, because when it roared into ankle-biting action on Saturday it was like welcoming back an old friend. An ulcerous, sarcastic old friend who delights in spitting pure bile, but an old friend nonetheless. Spin-off film In The Loop kept the momentum bubbling but this was the real thing.

The insults and paranoid bitching kicked off in the opening seconds and scarcely paused for breath, with Peter Capaldi's Malcolm, a masterclass in amorality, leading the way. Malcolm's every utterance is a withering blow to the guts but I particularly liked his phone remonstration - 'that's a wretchedly homophobic headline, you massive poof' - aimed at a red-top editor who'd run an unsympathetic story.

If I was nit-picking it would be the sneaking feeling that the idea of anyone getting hot under the collar over a Labour minister planning to send their child to a private school seemed a little last year. Hasn't any pretence at those kind of old Labour principles long since flown the nest? And the addition of Rebecca Front as the new minister didn't quite make up for the absence of Malcolm's pet rottweiler Jamie. But the writing in The Thick Of It is second to none, with the careerist bureaucratic underlings who prop up the whole decaying system ruthlessly exposed along with the backbiting nature of office politics. How would your colleagues assess you if asked their opinion by your new boss? Something like 'that's like asking what you think of skirting boards - I'm sure you need them but I'm not sure why'? That was unctuous Olly on ageing sidekick Glenn but feel free to lift it for personal use.

Rebecca Front on being in The Thick of It

Throughout its run, The Thick of It team will be sharing their experience of show here on the BBC Comedy Blog. Last week the producer Adam Tandy gave a handy overview of the story so far, and this week we're delighted to hear from new star Rebecca Front.