It's strange. It's very clearly Mitchell and Webb. You could tell that from a transcript: many of the ideas are ones that turn up in their later work and there's a lot of the clever poking of fun at ridiculous aspects of life that sets the pair apart from the catchphrase monkeys who make drivel like Little Britain. And it's very funny, technically, I think. It just doesn't make me laugh.
I can't watch That Mitchell And Webb Look without laughing. It's too good. But this I can. I watch a sketch, and I can see the joke, and it's clever, and I get the point, but there isn't the big impact punchline you get in their later work. It's like the it's entirely comprised of sketches rejected from the new show because nobody could quite make them work properly.
Quite interesting to watch, though. I feel like I've learned something about how comedy develops.