Catherine Tate

Big School is unapologetically old school in its comic approach - it is currently BBC Comedy's holy grail to find a popular, mainstream and peak-time sitcom - but I was pleasantly surprised by how entertaining and funny it was.

Nobody is ever going to die of laughter while watching Big School, but creating characters an audience wants to spend half an hour with is the bedrock of all sitcoms, and these are well drawn, good fun and beautifully played by an illustrious cast that resolutely resists the temptation to do 'funny acting'.

David Walliams - who shares a writing credit with the self-styled Dawson Brothers, who were presumably leaders of an outlaw gang before turning to comedy - stars as chemistry teacher Mr Church, who harbours unrequited feelings for french teacher Miss Postern, played by Catherine Tate.

Walliams is sweet and funny, but pitches Church at the asexual end of camp, which effectively prevents any romantic chemistry developing between the couple and drives one of the show's major themes up a particularly blind alley.

It is also a shame that the kids at the school hardly get a look-in on the action - an oversight that effectively doomed school-set sitcom Chalk back in the 1990s - as it is common knowledge among teachers that the students are the funniest, silliest and most unpredictable part of any school.

The second episode of David Walliams' easy going comedy, bringing together an ensemble of recognisable faces, including Catherine Tate as the new, 'glamorous but knows it' French teacher. That man from Ashes to Ashes (Philip Gleinster), who plays the moronic 'geezer' of a P.E. teacher. That guy from the BT adverts and Black Mirror (Daniel Rigby), as the 'real music' fanatic, and Rising Damp star, Frances de la Tour, in fine form as the hilarious drunkard of a headmistress.

Each episode plays out like a short film, with ever predictable plot twists, low points and resolution. Textbook stuff. However this is done with an unexpected charm and warmth, simply due to the character stereotypes and all of their cringe-worthy glory. This combined with the staffroom perspective is a fairly original mix, matched only by Chris Lilley's Summer Heights High (which if you haven't watched I strongly recommend).

Whether this form will get repetitive is still up to question however, as there's only so many times you can watch a short There's Something About Mary.

So if you're gouging your own eyes at the thought of having to sit through another moody police drama (even writing this fills me with dread), and long for something as light and easy as angels delight while watching Sesame Street, then tune in to BBC One at 9.

David Walliams' tedious documentary Snapshot in Time, in which he reunited old school chums, might have given cause for concern about his sitcom, entering its second episode tonight. But Big School is genuinely funny, the absolute highlight being Headmistress Baron, played by Frances de la Tour, who's brilliantly dry and has all the best lines. 'It had better not be a play about talking fannies,' she drawls from behind her huge desk before gulping from a glass of wine.

And Catherine Tate's not bad either as French teacher Miss Postern. Is it just us, or is she getting less outlandish (read: annoying) the more she's on telly? We approve. Miss Postern's unfounded haughtiness is snigger-worthy, especially when she's referring to mega pop star 'La Femme Gah Gah'. You see, this week the school is running a talent show and the teachers are taking part, giving Walliams's uptight character Mr Church a chance to get his oboe out for the ladies. Not laugh-a-minute stuff, but there are certainly enough funnies to amuse.

Aren't David Walliams, Catherine Tate and Philip Glenister a touch too old for the daft teacher parts they play in this old-school comedy? Or is that the point?

Either way, this is an amiable, oddly dated chip off the old blackboard - tonight built around a talent show - but, what with Waterloo Road and Jack Whitehall's Bad Education (returning for a new term soon), the TV syllabus is teeming with shows full of rubbish teachers. Give 'em a break!

The comedy gets much broader and blunter in the second episode of David Walliams's school sitcom, as seedy and inappropriate gym teacher Mr Gunn (Philip Glenister) thrusts pointedly in front of comely new French mistress Miss Postern (Catherine Tate).

Gunn and Mr Church (Walliams), the buttoned-up science department deputy head, are locked in a battle for Miss Postern's attention while she plays one off against the other. But she's a bit thick (she's never been to France and you have to wonder, generally, at her level of French-speaking ability), falling apart in front of frosty, iron-clad head teacher Ms Baron (Frances de la Tour, whom we don't see enough of). Tonight the staff, in a bit of Walliam's Britain's Got Talent self-reference, organise a teachers' talent show.

It's encouraging to see that David Walliams isn't above taking a pop at Britain's Got Talent. This week French teacher Miss Postern (Catherine Tate) decides to hold a charity talent contest for the teachers - to prove how wacky and zany she imagines she is.

It's a heaven-sent opportunity for love-struck chemistry teacher Mr Church (Walliams) to get closer to her with a duet. But as Walliams gets his oboe out, they face stiff competition from Philip Glenister's seedy gym teacher Trevor Gunn.

Big School succeeds because the cast is more than capable of ­spinning comedy gold out of some very crude elements.

Frances de La Tour as headmistress Miss Baron is magnificent tonight on the subject of Pudsey Bear. And Daniel Rigby's po-faced music teacher Mr Martin finally gets a chance to shine.

Best line of tonight's episode? It has to be Miss Postern's description of John Lennon as "one of the main ones of The Beatles".

We've all been burned too many times to take these things on trust any more. Still, the cast list of Big School (BBC1) couldn't fail to draw the eye, stuffed like a prize summer pudding as it was with juicy comedy names. Catherine Tate. David Walliams (a co-writer of the series). Joanna Scanlan (Terri Coverley in The Thick of It). Frances de la Tour. Frances de la bloody Tour!

All that promise means there's further to fall, right? Yes, usually. But this time it was great. Not perfect. But great.

The setting and the setup - teachers in an urban comprehensive who are lazier and less mature than the kids - is far from original. But Walliams, playing the head of chemistry, Mr Church, who is on the point of resigning until he has a coup de foudre when the new French teacher, Miss Postern (Tate), walks in, has here tapped into his warmer, more vulnerable, altogether funnier side. It's the one that makes him a wonderful children's author, rather than his colder Little Britain side. This performance, and his writing, gives the show good jokes and heart - which unless you are sure you are the next Seinfeld, generally works out best for all concerned.

And Tate's a genius. Her opening scene with Frances de la Tour's headmistress will keep me happy all week. "I love everything French!" she exclaims. "Not just the language. The history, the romance, the bread." I can't reproduce it here with just the paltry resources of the printed word, but it's the way she breathes the greatest passion into "bread" that sets you honking. And that's before De la Tour fixes her with a stare that's seen a thousand teachers come and go, and replies without expression on her face but an infinity of loathing in her voice: "Dirty people. Dirty country."

Look, you had to be there. But make sure you are next week. The second episode was trailed at the end of this one and trust me, you're going to want to see Mr Church dancing out of the dinner hall while raging at Miss Postern: "French is the poor man's Spanish!" Gold star.

I severely wanted to like Big School, if only to celebrate on the BBC's behalf their having launched two successful comedies in a row, the other of course continuing to be the sublime Family Tree. If so, it would have represented an almost unique triumph (yes, yes, but I've consulted my inner pedant and he reluctantly allows this) after a couple of years of embarrassing twock.

But I didn't. Despite a highly promising cast - Philip Glenister, showing he can "do" comedy; Daniel Rigby (the "annoying one" off the BT Broadband ads) showing he can actually "do" real acting, and rather good he is; the wonder that is Frances de la Tour, somehow growing increasingly sexy with age; Joanna Scanlan (the sublime Terri from The Thick of It) - it remained stubbornly written by and starring David Walliams, with all that entails.

Which is to say: too occasional mini-smiles leavening a fast succession of stereotypes, interrupted by a lazy cliche or three, shot through with embarrassing pieces of slapstick, most cringeworthy of which was the ancient teacher Mr Hubble going into an occupied classroom and opening his flies ("the loos used to be here..."). That was the savage low point; the highs were any scene involving De la Tour as the humourless alcoholic headmistress. This cast - and did I mention Catherine Tate? - surely deserves more subtle writing. But Walliams seemingly can't think but in stereotypes - I'm sure you remember even though I'm trying to forget the vile Little Britain, written in and somehow encapsulating the dark, dying days of New Labour.

Walliams has said it's "slightly subtler than Little Britain"; not the biggest of asks. So all the pupils - count them: all - are badly behaved, rude and street-smart. Mr Church, Walliams's character, drives an Austin Allegro, ho ho, and listens to Phil Collins, hoo ha. Alan Partridge it ain't.

I might watch another episode, if only because openers are notoriously ham-fisted, and there's a sparrow-flicker of interest over the Glenister/Tate/Walliams love triangle. But at this rate Walliams is in danger of being remembered only for the 167th fastest crossing of the Channel. Which would be no bad thing.

New sitcoms on mainstream channels always stare directly into the jaws of darkness as purse-lipped audiences wait, arms crossed, to be entertained. Big School probably faces an even more hostile reception as it's co-written (with the Dawson Brothers) by David Walliams, who also stars. I bet there are a few people waiting to take him down a peg or two.

So please give Big School a chance. It doesn't ooze sophistication, in fact it's pretty silly. But it has a great cast and I heard myself laughing out loud in a few places. Walliams is secondary school deputy head of science Mr Church, a shy man with a terrible perm who's inexperienced with women and who listens to Phil Collins in his Austin Allegro. But he's transfixed by the new French teacher, comely Miss Postern (Catherine Tate). Big School turns out to be rather sweetly old-fashioned - in a good way.

The public disembowelling of The Wright Way will have put a few comic heavyweights on alert about upcoming projects, but David Walliams doesn't have too much to fear where his new sitcom Big School is concerned. It may be a little light on jokes, but it's transparently good-natured, agreeably old-fashioned and with an adult cast so attention-grabbing that the pupils occasionally feel a little incidental to proceedings.

Walliams is Mr Church, the sad-sack chemistry teacher who withdraws his proposed resignation when highly desirable maverick French teacher Miss Postern (Catherine Tate) arrives to shake up Greybridge secondary school. Frances de la Tour's withering headmistress, Daniel Rigby's clueless music tutor and Philip Glenister's non-PC PE teacher all grapple over scenes to steal and prise some good laughs out of the sometimes slight material.

It's no Grade-A student, but Big School isn't expulsion fodder either - a decent achievement with so few new sitcoms worthy of a pass these days.