Nearly always it's the quiet ones that surprise you with their anger. Terry Pratchett's delightful series of surreal Discworld novels have long bewitched readers. Pratchett novels have always acted as gentle satires of our world, but Going Postal, the latest of his novels to be filmed by Sky was, by Pratchett's standards at least, monumentally angry.

Porcine bankers, the celebration of corporations, the moral vacuity of the concept of victimless crime and, er, the incorrect use of apostrophes, were all fed into the novel that was the source for this Sky adaptation. The anger was mollified for family viewing - but only slightly.

David Suchet, almost unrecognisable as a villain who resembled an ageing, heavy metal star, played Reacher Gilt - the rapacious owner of Clacks, a network of semaphore towers which are Discworld's take on the internet.

This was a man who had taken advantage of a banking crisis to move in and steal Clacks from its inventor. Gilt was enraged when the patrician Lord Vetinari (Charles Dance) pardoned conman Moist von Lipwig (Richard Coyle) on the understanding he revive the Discworld's postal service to provide some competition to Clacks.

Part of the glory of this fabulous chunk of entertainment was that Sky eschewed CGI in favour of lavish sets, constructed with lashings of sparkling invention. Going Postal looked amazing. Luckily, everything else about the production was dazzling too.

Coyle was roguish but sympathetic, and Andrew Sachs, as his assistant, bumbled along like a cross between his Fawlty Towers duffer Manuel and the original grandfather from Only Fools And Horses. Claire Foy, as Adora Dearhart, smouldered convincingly.

Terry Pratchett's Going Postal, a two-part special from Sky1 which concludes tonight, had a pretty distinguished cast too. Presumably the thesps in question were attracted not just by the money, but also by the always-welcome chance to don some eccentric facial hair and shout a lot. Then again, they could even have been attracted by the script - because the programme is enormous and imaginative fun.

Needless to say, with its origins in a Pratchett novel, the imagination does tend to the bonkers. Richard Coyle plays Moist von Lipwig, a con man rescued from hanging by the mysterious Lord Vetinari (Charles Dance, salt-and-pepper beard and moustache). He was then given the job of reviving the Ankh-Morpork Post Office, much to the fury of the man who runs the Discworld equivalent of the internet, Reacher Gilt (David Suchet, Fu-Manchu moustache, beard and eye-patch). Moist's allies include the elderly junior postmaster Mr Groat (Andrew Sachs, huge moustache) and the toothsome Adora Belle Dearheart (Claire Foy, no facial hair but obviously enjoying putting Little Dorrit behind her by smouldering sexily and generally carrying either a cigarette or a riding crop).

With these - and plenty more - elements in place, last night's episode rattled along nicely, easily passing the key test for all programmes that seek to create another world: we gradually stopped noticing how mad that world was. By the end, in fact, it seemed perfectly logical that a seven-foot clay robot should have persuaded Moist to confess that he'd been responsible for the forged cabbage bonds which ruined Adora's family - while back at the Post Office a young man obsessed with pin-manufacture was attacked by a flying monster.

Sky may not have the resources to churn out top home-grown drama on a routine basis, but when it does decide to throw its weight behind a production, as it's done for this latest Terry Pratchett Discworld adventure, then it certainly does it in style.

Shot in HD, and with a fabulous British cast that includes David Suchet, Richard Coyle, Charles Dance, Claire Foy, Andrew Sachs, Steve Pemberton and Tamsin Greig, this Bank Holiday two-parter (concluding at the same time tomorrow) is a typically outlandish Pratchett tale about a lifelong con man who's given one last chance to avert the death sentence. The deal? He must take on the seemingly cursed task of trying to rescue Discworld's Post Office, under threat from their equivalent of the internet.

Going Postal: Andrew Sachs on Mr Groat

Andrew Sachs tells us the highs and lows of being Tolliver Groat and what it's really like being an Ankh Morpork Postman!

Russell Brand and Andrew Sachs emerged from last year's scandal with their careers intact, but Sachs's grand-daughter Georgina Baillie looks like she's heading the way of Jonathan Ross. The one-time Goth stripper has filmed the pilot of a new vampire sitcom, and so far the critics have been less than enthusiastic. Vampire Georgina stars Baillie as a pretty young blood-sucker who confesses her misdemeanours to the camera from her bed. Manuel has gone down in TV history as one of the greatest sitcom characters of all time, but we fear the talent has failed to cascade down the generations. If you don't believe me, see for yourself at vampiregeorgina.com.

My reviewer's DVD of the first of Channel 4's enterprising Comedy Roast was incomplete. It lacked a title sequence and, at the end, a caption read "CRAWLER CREDITS". But there were no crawlers to credit. Perhaps for the first time on British television the showbiz mafia came not to praise but to bury one of its godfathers. Still, as with the best man's speech, the tone is hard to get right. On The Larry Sanders Show the fictional chat show host was rendered suicidal by his friends' merciless "tributes". You don't want that. But you do want some of the barbs to hurt.

Bruce Forsyth's age was a subject of jokes back in his 1970s heyday and, even though, at 82, they are rather more acute now, they are still more affectionate than cruel. Jimmy Carr, the show's MC, led the way with them - Brucie was the first in his community to walk upright and use tools etc - but it was Jonathan Ross who took on Forsyth's real vulnerability: his marital record. Doing a passable Brucie impression, Ross mimicked him saying "I've told my wife we are working late, so we have ten minutes for a quickie, Anthea." Anthea Redfern, The Generation Game's lovely hostess, was to become, younger viewers may not know, the second, but not last, Mrs F.

He was not thanked for his efforts, even though Wilnelia Forsyth, herself, pointedly mentioned her husband's three wives. It was a deadly reminder of how lonely it is when you fall from favour as Ross, following the Andrew Sachs debacle, clearly has. Sean Lock was surprised Ross had turned up in person "because normally if you want to insult an elderly national treasure, you do it on the phone". That was good but it was Forsyth himself who did most damage. Eric Morecambe would have ripped into Ross ("I am sure he would," said Ross glumly). Ross was "all washed up and not even 50"£. The Ross-hating press has been accused of hyping Forsyth's attack but I think Ross had got to him, and for that he should be congratulated. A well-concealed side of Forsyth was briefly exposed.

Andrew Sachs probably won't be tuning in for this one. Jonathan Ross and Russell Brand are reunited on television for the first time since Sachsgate. However, this being Channel 4, don't expect a grovelling apology at the beginning but plenty of jokes about telephone calls, Spanish waiters and Satanic Sluts. Jimmy Carr is in the chair for what has become an annual festive highlight, poking fun at the biggest stories of the year. Ross and Brand have been cheekily paired together and up against them will be Claudia Winkleman and Rob Brydon and David Mitchell and the TV critic Charlie Brooker, making his first appearance. Peter Andre is among the celebrity questioners, but rumours that Tiger Woods will be appearing are wide of the mark.

I've always wanted to dislike Russell Brand, but I can't quite do it. That said, I don't know what it is about him that I do like, I just know I can't dislike him as much as many do.

Even after Sachsgate - which demonstrated a level of purile stupidity that I expected from Ross but not Brand - I still can't wholly have an aversion to the man. I suspect it might be nothing more than the fact that he makes me laugh, and it's hard to abhor someone who amuses you.

He's witty, he can - one assumes, given the number of ladies he's been involved with - be charming and he can be self-deprecating when it's required. However, this sit down with Frank Skinner told us nothing we didn't already know and was, to be honest, just a pi**ing contest between the two to see who could be funniest.

We heard from both several tales of how fame had gone to their heads, both the ones they keep on their necks and the other ones, and the effect that something Brand described as "oestrogen mist" had on them. Basically, they have both been offered nookie on a plate from adoring female fans and both have partaken from that bottomless trough often.

Skinner questioned the moral rectitude of doing so and seemed genuinely embarrassed that he'd taken full advantage of that particular form of hero worship, but Brand answered the relatively serious question with jokes, so it lost any depth it might have had.

There was of course lengthy discourse about the Andrew Sachs affair and Brand rather confusingly at once apologised - again - and then refuted that he'd done anything that wrong in the first place. He did however - rightly in my opinion - proffer that much of the fuss wasn't about the incident itself but the wider issue of celebrity salaries and the BBC licence fee.

Overall, this was like Jeremy Paxman interviewing Bungle after a spliff; one didn't expect it to be deeply serious, just somewhat informative in its endeavour, but it just didn't have the energy to get past the giggling stage.

Documentary following the controversial comedian on his 2009 Scandalous tour, culminating in a sold-out gig at London's O2 Arena. There's also a candid chat with fellow comic Frank Skinner in which Brand opens up about his drug and sex addictions, and the matter of messages left on actor Andrew Sachs's answering machine.

Cast members link up for Hitchcon '09

Simon Jones and Mark Wing Davey are being joined by Andrew Sachs and Harry Shearer of The Simpsons fame as cast members for a one-off radio-style performance of "Hitchhiker's Live!" at Hitchcon '09.