Hi, my son who is now 18 was born in South Africa and we returned to the UK when he was 4.  As you say there is not much known about CAH there,but  there is a very knowledgeable endocrinologist  Professor Benechi in Cape Town. If you would like to contact me directly geertsma @ tiscali.co.uk (no spaces).  I also know of a doctor in Durban who has a son with CAH.  There is an excellent book out A Parents Guide to Congenital Adrenal Hyperplasia C. Y. Hsu and Scott A. Rivkees, M.Dhttp://www.authorhouse.com/BookStore/ItemDetail.aspx?bookid=27871 which I am sure you would be able to buy from South Africa - this explains and tells you everything about CAH.