I recently attended a Graham Norton Show recording, so I can bear witness that it's a brilliantly slick operation and Norton is a master of audience-wrangling, winning us all over immediately and making us feel a big part of the show - though not bigger than the array of guests, who we'll see again in this end-of-series compilation.

Remember Madonna, being her usual steely and scary self, despite Norton's efforts to try to get her to loosen up a bit? And what of the great Sir David Attenborough, all soft and mooning, not over a gorilla, but a comely young woman - actress Cameron Diaz? Just watch his face as he hangs on her every single word.

We also see again Dame Judi Dench, Hugh Grant, Katy Perry and the voluble, unstoppable force that is Will Smith.

This new impressionism show started on Channel 4 this week as part of a big comedy line up on the channel (along with 8 Out of 10 Cats, Alan Carr: Chatty Man and Stand Up For the Week).

It features Morgana Robinson and Terry Mynott impersonating a certain range of people. In this first episode there's heavyweight political figures but instead that particular class of usually pointless celebrity - the likes of Gordon Ramsey, Amy Childs and Danny Dyer.

Now for me impressionism usually has one big problem, which is trying to get the performer to look like the person they are pretending to be as well as getting to sound like them. That's why I think the best impressionism shows are Spitting Image and the radio version of Dead Ringers, because in both shows you don't see the performers, only the image in your head, or the rubbery visage.

In terms of this show, I'm not the best to judge the quality of the impressions, although that's because I tend not to watch most of the shows that those particular people perform in. I've never watched The Voice or Embarrassing Bodies, so I don't really know what Jessie J or Dr. Christian Jessen sound like.

However, in terms of the ideas that were generated, I found them to be good. I liked the sketch in which David Attenborough was observing Frankie Boyle in his natural habitat, and Fearne Cotton's children's game show in which kids try to act like celebrities.

If I were to be more critical I'd say that the satire isn't as hard hitting as it could be. It's not as vicious as Spitting Image was, so it's more akin to Dead Ringers in that respect. But still, it's a decent enough programme and should do well in my opinion...

The showpiece of Channel 4's new Friday night comedy line-up is a brand new impressions show.

Morgana Robinson appears with one of her co-stars from The Morgana Show, Terry Mynott - a comedy actor so unfamous he doesn't even have his own Wikipedia page yet.

But he absolutely steals this first episode with his spot-on take of the BBC's favourite groovy scientist Professor Brian Cox, posing in front of areas of natural beauty wearing high street brands.

It's the voice that makes it so funny - and it's a parody that's cutting but sweetly affectionate too.

I doubt though that Bear Grylls will be as pleased with the job they've done on him as he tries to survive in the suburbs.

Mynott's take on David Attenborough explaining the lifestyle of Frankie Boyle is another zinger.

Behind the rubber masks, it can be hard to tell who's doing who.

Morgana impersonates men too. Her Russell Brand isn't a patch on her Natalie Cassidy, though.

In the 70s, audiences laughed in appreciative recognition as Mike Yarwood impersonated a range of public characters, even including trade union leaders. With latterday cultural fragmentation and the thin spread of increasingly nondescript "celebrities", the job of an impressions show such as this, starring Morgana Robinson and Terry Mynott, becomes all the harder. It is telling that they often have to announce who it is they're doing. Still, this is as capable as could be expected; in the first episode, Bear Grylls tries out his survival skills in the suburbs, while David Attenborough studies at close hand the remarkable animal that is Frankie Boyle.

From Spitting Image to Dead Ringers, satirising powerful public figures through mischievous impressions has been a popular shtick among British comedians. But Channel 4's new sardonically named sketch show, led by able newcomers Morgana Robinson and Terry Mynott, subverts the familiar blueprint. Like Bo Selecta's less surreal cousin, it opts to target C to Z-listers - products of ITV2 celebrity filler, the blogosphere and reality TV.

By design, this is a dangerous game, often relying on an audience obsessed with the kind of inane "celebrity" culture it seeks to send up. So while it's just about possible to relate to a sketch involving ex-EastEnder Natalie Cassidy in a faux reality show called I'm Doing This Now - "just hosing down the bins, really" - a mocked-up musical with Joe Swash and Stacey Solomon falls flat.

Ultimately, it's the humour involving better-known subjects - including uncanny impersonations of Gordon Ramsay and David Attenborough - which keeps Very Important People afloat. It's a brave experiment, taking a deserved swipe at vacuous popular culture norms. But will people see the funny side?

There are two key questions for Ross to ask tonight's headline sofa-shufflers. Sir David Attenborough's appearance can't pass without a discussion about why it wasn't obvious to viewers that some of Frozen Planet[/i]'s scenes of a polar bear and her cubs were filmed at a Dutch zoo. And Daniel Radcliffe's role in the new Hammer version of The Woman In Black must provoke Ross to ask, "What did you think of the screenplay?" The only possible answer is "brilliant." Ross's wife, the very talented Jane Goldman, wrote it.

There's a strong line-up of guests for Wossy to grapple with obsequiously tonight. First up is former boy wizard Daniel Radcliffe, who talks about his first post-Harry Potter film role in the forthcoming spine-chiller The Woman in Black (a film adapted from Susan Hill's novel, incidentally, by Ross's wife Jane Goldman). Secondly, there's garrulous Mighty Boosh star Noel Fielding, who's about to launch his brilliantly surreal new E4 show Luxury Comedy. Finally, and requiring no introduction, is Sir David Attenborough. British soul singer-songwriter Seal also drops in to perform his new single, Backstabbers.

There are touches of brilliance in Harry Enfield and Paul Whitehouse's latest series. Everyone will have their favourite sketches but the plummy old men in a gentlemen's club discussing which famous people are "quare" are the highlight for me. "If he sounds like a quare and he looks like a quare I should think he's a probable quare," they concur. This week Ian Hislop and, shockingly, David Attenborough are up for discussion. Not all the sketches work so well, but for fans there's good news: Café Polski is back in all its sad glory.

Doc Brown: Grandpa Dave aka David Attenborough

The talented Doc Brown (aka Ben Smith) kicked off his brilliant series of new music videos on BBC Comedy with his hip hop eulogy for a fallen, albeit furry, gang member Jimmy Wiggz. Next up, is some lyrical love for Grandpa Dave aka David Attenborough.

Porridge is 'best programme ever'

Porridge, the television comedy about life behind bars, is the greatest programme ever made, according to Sir David Attenborough.