PPL in South Africa?
A couple of points to remember about using a SA PPL in the UK. You can but if you want to fly a type (not a class) in the UK that is not in your log book, you have to have a check ride with an instructor with a SA rating. E.g if you have a C152 but not a C172, without a check ride, you can't fly the C172. In fairness you can't in SA either but life gets interesting when you want to fly say an unusual or PFA type.
At the moment only Irv Lee at Popham can do check rides in the UK and -oh yes - there's one other slight difficulty. If the type you want to convert on in the UK has no representative on the SA register, bad luck. I'm going through the mill right now and the SACAA tell me that they have no intention at present of changing this situation to be in line with JAR and FAA (which have class ratings on your licence).