His show is different. No where else can you see high ranking diplomats and politicians get asked mind-numbingly stupid questions. It's fun to see how they handle it. I remember the episode with Ralph Nader and in particular.
The British 'cockney' accent is funny as hell, making him sound unpolished and makes it funnier. A British interview would be held by someone with a Roger Moore type accent.. lol
I was born in England and used to talk like that, so i can relate to it more.