Hi Trevor, and everyone.
I noticed today that of all their millions of subscribers Ancestry has only 11500 who have known autosomal links to South Africa. Of those I have 236 matches, quite a high proportion. Of course, a lot of Subscribers don't have family trees, making it difficult for the algorithms to work properly. However, I have found this website the easiest to use, and have cross-linked a lot of family and cousins using the cousin matches. The Cape genealogists have really a great detail of information, and Natal is building. There is a lack of information going back more than say five generations, on 1820 settlers. So, that is, knowing where exactly families came from before joining the immigration. We have also discovered through DNA testing a large familial connection to the Native Americas, which was a surprise, and we are discovering roots in the Americas our family didnt realise we even had, the genetics coming with the sailors, some of whom were Native Americans. It's an exciting field opening up all the time.