I've heard mixed review from people doing Ron Haslam's school, some say great, others said not - like a friend who holds her own in the fast group on track (got the day as a pressie) and ended up paired with a guy who got up to 65 on the straights and 15 round the corners > - bit of a mis-match there. She complained and ended up getting racer and instructor Jon Kirkham to herself for the afternoon and had a good time.
Quite a few friends, both male and female, have done CSS and without exception absolutely raved about it - if you want some seriously good tuition I'd say that's the one to do. Unlike Baza's summary of the RH school you'll end up knowing an awful lot more about what you're doing and how and why you're doing it.
Just do it ok?