@papayalily, mind, they’re mostly comic actors and/or writers. The ones who also do stand-up I’ll put an asterisk next to:
Bill Bailey*, Peter Cook, Jennifer Saunders, Chris Morris, Harry Enfield*, Dave Gorman*, Billy Connolly*, Robert Webb, David Mitchell, Spike Milligan, Rowan Atkinson, Catherine Tate, Vic Reeves, Bob Mortimer, Steve Coogan, Richard Ayoade, Nick Frost, Simon Pegg, Mark Heap, Ricky Gervais*, Peter Kay*, Sacha Baron Cohen, John Oliver*, Ben Elton*, Dawn French, Stephen Fry and Hugh Laurie (as a double act), Tamsen Grieg, Dylan Moran* (Irish, but works in the UK), Tommy Tiernan* (Irish), Graham Linehan (Irish, but works in the UK), Craig Ferguson*, Stewart Lee* (he’s a lot like the late Bill Hicks, but Scottish), Kevin Eldon, John Cleese, Michael Palin, The League of Gentlemen, Rowan Atkinson (except for when he does Mr. Bean)