Paul Merton, Bill Bailey, Rob Brydon, Stephen Fry, David Mitchell, John Cleese, Linda Smith (sadly missed) and Jack Dee are all great, off the top of my head. Ian Hislop as well if you'd count him. The gang off I'm Sorry I Haven't a Clue (Tim Brooke-Taylor, Graeme Garden, Barry Cryer and the sadly missed Humphrey Lyttleton) are also great.