Comparisons are all but unavoidable in the case of Reggie Perrin, a remake of The Fall and Rise of Reginald Perrin, with Martin Clunes making the bold attempt to fill Leonard Rossiter's boots. I don't know if I can stress enough what a depressing idea this is on paper. A television channel should always have the ambition to create its own fond memories rather than lazily refurbish those from 30 years ago. And if you do go the recycling route you're likely to find that the fond memories of five years ago will probably get in the way. When David Nobbs's sitcom first went out, its bleak take on the purgatory of office life had very few rivals. The remake has to compete not only with memories of its own source, but also of The Office, a comedy that effectively rewrote the rules about how you could tackle the anomie of the nine-to-five.

It really is a bit surprising, then, that Reggie Perrin should work as well as it does. Martin Clunes helps a lot. He looks funny when he's glum, in a way that's sufficiently different to Leonard Rossiter. And the script - a collaboration between Simon Nye and David Nobbs - has some good lines in it. Reggie doesn't work at Sunshine Desserts anymore (though he walks past the sign on his way to the office), but at a grooming products company. CJ is younger and rather less dependent on his "I didn't get where I am today" catchphrase, and Reggie's toadying subordinates have been replaced by an unconvincing pair of marketing-types. It's not a disaster, by any means, which may be the best you can hope for from such an unimaginative commission.

We tried to pretend this didn't exist before and wasn't a 1970s TV great mixing misery and mundanity in a cynical sitcom. Pretend it's brand new. Come to it fresh. The verdict: this is quite a funny sitcom with a few good characters and a few good lines, possibly even worth watching throughout its run. Without such pretence: this is a horribly weak, unnecessary remake with all the lovely unique touches ironed out by the BBC comedy department's blandness steamroller, no doubt inflicted by Simon Nye, who can churn out humdrum sitcoms in his sleep and has been paired up with Perrin's brilliant creator David Nobbs.

The fall and rise and fall and rise and fall

Individual lines, which may have been Nobbs's, and may have been Simon Nye's, were fine, and Martin Clunes did a fair job as Reggie, also driven to fantasy by his humdrum life. But there was something wrong about the whole thing.

The nation can breathe a collective sigh of relief. The new Reggie Perrin is not an insult to the memory of a much-beloved original, in fact, it's a rather good sitcom in its own right. Simon Nye and David Nobbs' remake cranks up the misanthropy and the joke count, with Martin Clunes bringing his own brand of caustic charm to the role of the executive suffering existential angst.

You'd have to be very brave or very foolish to tackle a remake of classic 1970s sitcom The Fall And Rise Of Reginald Perrin. As this was written by the novel's author David Nobbs together with Men Behaving Badly creator Simon Nye, it's definitely a gamble worth taking.

It helps that Martin Clunes, who has the unenviable task of stepping into Leonard Rossiter's shoes as the downtrodden office man, looks nothing like the 70s star. Viewers who remember the original will be preoccupied with making comparisons. So what else is different?

Modernisation means that even Reggie's fantasy life must be politically correct - so no more hippo fantasies. And as his boss Chris Jackson, Neil Stuke has a the difficult job of measuring up to John Barron's masterful CJ.

What is strange is the fanciful excuses Reggie used to give each morning for why he was late now sound exactly like announcements commuters hear every day. "Wrong kind of passenger at South Norwood?" Why not?

Martin Clunes is a first-rate comedy actor, but also a very courageous one if he's willing to tackle a character created by comic genius Leonard Rossiter. Yet although Clunes lacks Rossiter's manic edge, nobody does grumpy curmudgeon better and there are other differences in the series that augur well, not least that Perrin creator David Nobbs has co-written this series with Men Behaving Badly creator Simon Nye, who understands Clunes' talent well.

Characters like Wendy Craig's Marion, Reggie's disapproving mum, are refreshingly new and there's promise in the casting of Fay Ripley as Perrin's wife and Geoffrey Whitehead as her father.

Oh dear. This won't be the worst thing you'll see this year. But, with its canned laughter, wobbly sets and dated jokes, it might just make your top five. 'Reimagining' (darh-ling!) a hallowed TV classic is probably never wise, even when you have the original writer, plus Simon Nye, plus a great cast on board. Martin Clunes isn't horrendous as mid-life crisis-struck Reggie, but hey, he's no Leonard Rossiter. And he has to make the best out of ancient gags such as 'Anything that bleeds for five days without dying deserves a bunch of flowers'. Which we're sure was recycled from his Men Behaving Badly days.

It does not say much about broadcasters' confidence in new writing when they fall back on reviving something tried and tested. There seems to be a lot of this about at the moment. It has just been confirmed by the BBC that Martin Clunes is going to recreate the classic lead role made famous in the seventies by Leonard Rossiter, in a remake of The Fall And Rise Of Reginald Perrin. It will now be called simply Perrin and no doubt there will be lots of headlines about Reggie behaving very badly.

Clunes is always good value and quality writer Simon Nye is working on it with Reggie's creator David Nobbs, which sounds good. The only thing that worries me is that we have slightly been here before with The Legacy of Reginald Perrin, the 1996 series that, unlike the forthcoming version gathered together original cast members, but like the forthcoming version, lacked the real star, Leonard Rossiter, due to Rossiter being dead. Which is a bit like Hamlet without Hamlet.