I never 'got' The Mighty Boosh but after being subjected to it time and time again, I've enjoyed it since. IT Crowd is pure brilliance. I don't understand what NOT to get on it. I've never really watched much Father Ted so can't really comment. I just know some people who are big fans. I do have to say though that one of my all time British Comedy favourites has to be Black Books!! Everytime I watch it I'm practically crying with laughter.
PS. Can't STAND Alan Partridge and don't really find Pheonix Nights/Max and Paddy all that funny.