Just found an actual comedy panel show (though it may or may not be a comedy panel game) taping while I'm in London - Sky Atlantic's new show "New Britannia", hosted by, of all people, Morgan Spurlock (director of Super Size Me, The Greatest Movie Ever Sold, etc.)
According to Applause Store, the show "focuses on life in modern Britain seen from an American point of view" and features both US and UK comedians. Sounds good to me - I've already put in my ticket request.
EDIT: Just got an email from Applause Store with my tickets to New Britannia. I guess I'll find out if it's a game show.