In its one-off revival last night as Rock & Chips, Only Fools and Horses, the BBC's over-loved hit from the Eighties and Nineties, performed a genre-bend. A broad, sentimental, Cockney sitcom became a comedy-drama of charm and subtlety that did its writer John Sullivan nothing but credit. It is possible, I concede, that as an irregular viewer I missed nuances in the original, but for most part Only Fools stays in the mind - does it not? - for the chandelier smash, Rodney and Del Boy's foggy transformation into Batman and Robin, and David Jason's perfect fall through a non-existent bar, a moment pilloried with splendid unfairness by the comedian Stewart Lee for being repeatedly voted television's funniest moment.

There was almost no physical comedy in Rock & Chips, a prequel set in 1960 (it felt earlier). Del Boy was a teenager, Rodney not yet born and their mother, Joan, not merely still alive but, in Kellie Bright's winsome portrayal, still sexy. (I'll never think of Kate Aldridge, whom she plays in The Archers, in the same way again.) The 90 minutes' broadest point was Phil Daniels's moustache, donned to complete his misjudged turn as Grandad. Joan's boss's lascivious attentions to her bosom would also count as seaside postcard humour were they not undercut by the seediness of his masturbating after each of their encounters.

Instead of big laughs we were delivered a genetic explanation for why Rodney was as he was in Only Fools: melancholy, disappointed, brighter intellectually than his half-brother Del but without his neon-glare personality. His father, an unknown quantity in the series, turned out to be a ruthless jailbird with an artistic streak called Freddie Robdal (pun), who seduced his mother right under the careless supervision of Del's idle father, Reg. Nicholas Lyndhurst who, of course, played Rodney, here played his father, Freddie, and produced a detailed performance that suggested the con's psychotic tendencies could be tamed by the right woman. It was from Freddie that Rodney must have got his brains, for Joan was so thick she did not get a single joke that Freddie pushed her way. From Joan, he clearly inherited his stoical sadness.

As the really boyish Del Boy, James Buckley conveyed during his relatively brief screen time his Oedipal feelings for his mother and an early surefootedness in business, if not in society. Joan, looking down at her new baby, predicts, not unreasonably, that Del will be rich one day. From another high rise Freddie looks down on them. She nods her head. He raises his glass in pride. His paternity has finally been acknowledged. The question posed by Rodney in the last Only Fools and Horses, did his father love his mother, has been answered. Full of astute period details, such as the family planning clinic where a room of Mrs Smiths await their pregnancy tests, and with enough good lines to get by on (a snail looks like "a bogey in a crash helmet"), Rock & Chips was better than the sequel that preceded it.

You won't get any clues from the terrible title, but this feature-length chunk of rosy 1960s nostalgia is a "prequel" to the beloved Only Fools and Horses, which left our screens for good in 2003. Doubtless there'll be a ready-made audience of millions for John Sullivan's fond look at the beginnings of Del and Rodney Trotter, and their hopelessly small-time business empire. As for anyone else, it will depend on your tolerance of cheery cockney wide boys and diamond geezers. There's no David Jason - Rock & Chips' Del Boy is a cheeky, mouthy fresh-faced teenager who's already a bit of a wheeler-dealer - as this is really the story of Del and Rodney's sainted mum, Joan (Kellie Bright), a beehived, brassy, hard-working woman who's married to a layabout. But Joan's head is turned with the return to Peckham of the suave crook Freddie Robdal after ten years in Dartmoor. He's played by Nicholas Lyndhurst and Only Fools devotees will be in on the joke straightaway, as they all know that Freddie "the Frog" was Rodders' dad. Don't expect broad Only Fools belly-laughs, though; just gentle smiles of recognition.

A star-studded adaptation of a Terry Pratchett Discworld novel, first shown last year, elaborates on the author's belief that fantasy is not only about wizards but also about "seeing the world from a different perspective". With some impressive special effects, the story tells of Rincewind (David Jason), a failed wizard, who acts as a guide to Discworld's first ever tourist, the naïve Twoflower (Sean Astin). It's a journey that has the pair battling druid mercenaries, bad wizards and trolls as Rincewind tries to get the better of his nemesis, Trymon (Tim Curry). Christopher Lee, Brian Cox and David Bradley also feature in the cast.

Sir David Jason on the set of Sex, Drugs & Rock'n'Chips

Sir David Jason stopped by to give some tips to the young Del, James Buckley.

I love comedy. You muck around for a few hours...

HE'S the man who will do for winkle-pickers and leather jackets what David Jason did for camel-haired coats and cocktail umbrellas.

Up-and-coming actor James Buckley has scooped a dream role playing a young Derek "Del Boy" Trotter.

Many will be just as keen to see how the 22-year-old fares as the London wheeler dealer originally played by David Jason.

But James is no stranger to playing a cheeky chappy. He said: "I've always watched comedy, and being a comedic actor is what I'm quite good at. It's simply a lot of fun.

"I've previously done heavier parts where you really have to get into character.

"But I prefer a job where you can turn up and work with a group of people you really get along with, muck around for a couple of hours, film it and go home."

How do we feel about this? Personally, the idea behind it doesn't sound too bad, but I have little faith in John Sullivan these days. Only Fools & Horses was a classic that was unwisely brought back for specials after the perfect ending of the 1996 special (where the Trotters finally became millionaires), but a lot of its early success was down to David Jason, Nicholas Lyndhurst and the rest of the cast.

I'm not sure how a prequel could ever duplicate the original cast's chemistry. Really, it feels like Sullivan is all out of ideas. He's already spent the past few years writing Only Fools spin-off The Green Green Grass (focusing on supporting character Boycie moving his family to a rural mansion), and that's arguably one of the worst sitcoms around today. The fact it enjoys fairly healthy ratings just beggars belief, but I guess there aren't many sitcoms catering for the over-50s today.

Oh well. I'm at least interested, because the idea doesn't sound too terrible on paper. If John Sullivan can somehow find his spark and they cast great actors in these roles, it stands a chance. In particular, they need to find someone who can do a passable Del Boy impression as the teenage Trotter, and it would be nice to imagine Jason himself agreeing to play his own screen father Reg. Or is he clever enough to keep his distance?

ITV pulls plug on Micawber

At ITV David Jason's name is as good as gold. He guarantees ratings, brings in the gongs and crucially coins in the advertising revenue. But today ITV bosses have been forced to admit he has temporarily lost his sheen as they axe Micawber, the drama series based on the character from Dickens' classic, David Copperfield.

John Sullivan: The spirit of Christmas present

The pious folk of Dickensian England would be reassured to know that one man still looms large over the nation's Christmas, but mystified to find that his name is not Jesus, but Jason. On Christmas Day, the return of Only Fools and Horses, starring David Jason, is all but guaranteed to deliver BBC1 its highest viewing figures of the holiday period. On Boxing Day, Micawber, starring David Jason, should do the same for ITV.

ITV creates a Dickens of a problem for the BBC

There was a chilly welcome on the shores of Lake Geneva for the BBC at the Golden Rose of Montreux TV Comedy Festival yesterday when ITV announced it had captured two of the corporation's prime assets. David Jason, the star of Only Fools and Horses, is to play Mr Micawber in a four-part comedy-drama series scripted by John Sullivan, who wrote Only Fools and Horses.

ITV recruits Jason for Dickens drama

ITV has signed up David Jason to star in Micawber, Yorkshire Television's forthcoming drama based on the character from Charles Dickens' David Copperfield. David Jason, star of The Darling Buds of May and A Touch of Frost, will play the title role in the 4 x 60-minute drama. It is understood to have a budget of £800,000 to£1 million per episode.