Hi EA,
You can fly from Cape Town or Stellenbosch and the rates are about GBP35 per hour for a Piper Warrior or GBP75 for a Piper Aztec. To validate your licence, you will need to do an open book air law test, flying skills and navigation test as mentioned by "invalid entry". The costs excluding aircraft and instructor are about GBP2 for the radio licence, GBP20 for CAA validation and GBP7 for the licence. There could be a small charge for some ground briefing. Hope that helps and let me know when you are coming to Cape Town and I will organise it for you.
Cheers