If just two writers can make a show this funny, then it just shows how crap something like Touch Me I'm Karen Taylor is, that has about 14 writers.
The repetition could become annoying but at least it added something to the sketches each time (apart from the Holmes & Watson and the Shopping Channel), unlike something like Little Britain or Catherine Tate which is just the exact same sketch with practically the same dialogue every week but just in a different location, all leading up to a catchphrase. So aslong as that doesn't happen I'll be happy.