Rob Brydon

The competitive comedians are up early to visit Bolton Abbey: "I liked Bolton Abbey before you liked Bolton Abbey," carps Steve Coogan to Rob Brydon, before they launch into a scene, standing in the graveyard, where they imagine Brydon's funeral and what Coogan might say at it. This is the prelude to a delicious pratfall, a sunlit breakfast and a lot of singing (about the only thing the pair agree on is a love for Abba's The Winner Takes It All.) It's all enjoyable and, as a muted meditation on celebrity and friendship, less insubstantial than it looks.

On paper, The Trip sounds bloody awful: a cosy, luvvie giant in-joke for Steve Coogan and Rob Brydon, showing off their impressions and them eating ridiculously fancy meals. So why is it so completely brilliant? "It's not about the destination, it's the journey," as 'Steve' described his refusal to use satnav, but referring also, surely, to the incidental banter and bickering between them which is gradually revealing their true selves. Or 'true selves'.

And it's also hilarious: their Michael Caine-off, "we rise at dawn-ish" and last night's ABBA duet may soon replace Alan Partridge's most quotable lines as the things fans greet Steve Coogan with. Which will be some small compensation for him still not being able to do Rob's "I'm a small man in a box" voice.

Filling me with feelings of inadequacy for the comparative dullness of my banter, the relative poverty of my impressions - are Rob Brydon and Steve Coogan, regrettably coming towards the end of The Trip. There's been precious little else on the box these last few years that has got my wife and me shedding big fat tears of laughter, but The Trip never fails to oblige. I love it for its originality and its daring. And hats off to Coogan in particular for allowing himself to seem so obsessed with his place in the entertainment firmament. Last night, he compared his own three Baftas to Brydon's none, which wouldn't have been quite so funny without the suspicion that he meant it.

All Rob Brydon and Steve Coogan do in this series is tease each other over expensive lunches, bicker a bit and do silly voices. How hard can that be? But after a while you realise there's more to this banter than meets the eye. It's impossible to tell how much is improvised and how much scripted, but when they go off on one of their comic riffs, it hardly matters. Tonight's subjects under discussion include Abba song The Winner Takes It All, film roles they didn't get (or were cut out of) and Woody Allen versus Les Dawson.

We're almost at the end of this unique comedy creation, which serves up English countryside to the tune of top level bickering from Steve Coogan and Rob Brydon over a series of very expensive lunches.

Part of the fun is working out how much of their not very polite and utterly random dinner party conversations have been thought out in advance, and how much is just flowing off the top of their heads as the food gets shovelled in.

Tonight, in the Nidderdale Valley, they're riffing on an Abba song, the comparative merits of Les Dawson and Woody Allen, and they learn more about limestone than they could possibly ever want to. Yes, it's all very moreish.

Steve Coogan is currently drawing plaudits for his role opposite Rob Brydon in the wonderfully enjoyable The Trip, but here he turns his sizeable comic talents to this double bill of Chekhov plays. In the first instalment, The Dangers Of Tobacco, Coogan is at his bitter best in a role as tragic as it is comic. There's a distinct change of place as Mathew Horne takes centre stage for the night's second play, The Proposal, which is a fast-paced farce that serves up smiles by the bucket load. Both are simply superb and offer the ideal solution to stave off the Sunday blues.

After tonight's penultimate episode, devotees will have watched two and a half hours of the comedians Steve Coogan and Rob Brydon playing lightly fictionalised versions of their real selves as they joke their way around an uneventful culinary tour of the North. This may sound like TV's answer to a large dose of Tuinal, but somehow the two men have managed to create something that's genuinely funny. Tonight's instalment takes them to the Yorke Arms, Harrogate, and contains one of the most surreal Woody Allen impersonations you're ever likely to hear.

The Trip (BBC2) got a thumbs-down in its first week, with many unable to see the point of sending Steve Coogan and Rob Brydon up north to eat and drink themselves silly while trying to outdo one another with their impressions. Well . . . the point is that it's one of the funniest things on TV. Yes, it can get a bit too cute at times, but the blurring of real and scripted identities gives the comedy real edge. The highlight this week was Brydon asking Coogan how it felt to have a career in nosedive after massive success early on; Coogan's reply was that it was better than always having been a mediocrity. I'd say it took a lot of guts on both their parts to leave that in.

Steve Coogan, fretful, vain and self-absorbed, thinks he might have met the female photographer who has arrived to take his picture somewhere before. This kind of thing is always a worry to the comedian, who tells his agent, "They [people in general] remember meeting me, but I don't remember meeting them." It's another corking instalment of Michael Winterbottom's funny, acute improvised observation of the odd, frequently jagged friendship between Coogan and Rob Brydon, his travelling companion on a northern road trip reviewing restaurants. Brydon is the more appealing, doing impressions during a difficult dinner with a peevish Coogan, his agent and said photographer. There's a brittleness to the fictionalised (or is it?) Brydon/Coogan relationship that gives The Trip its delicious edge.

Rob Brydon and Steve Coogan are comedians of sufficient calibre that this series, in which they play versions of themselves on a restaurant-reviewing tour of the Lake District, was always likely to be funny. Four episodes in, it is revealing depth too. They eat at Hipping Hall in Lancashire, where they are joined by Coogan's assistant Emma (Claire Keelan) and a Spanish photographer, Yolanda (Marta Barrio). Coogan and Brydon revive the battle of celebrity impressions they fought in the first episode, amid increasing sexual tensions. "Is there a condition in Spain of Autistic Impressionist?" Coogan asks Yolanda, of Brydon. Brydon responds by quoting Alan Partridge at Coogan. "I'd quote your own stuff back at you," replies Coogan. "But I can't remember any of it."