Sander, you need to state what flag the boat has - if it has an SA flag, only a qualified and SA licensed skipper
may take it out of the country. I note that you are in the UK and thus may have flagged the boat under a different countries flag. In that case, anybody can take it out of the country. However, as it was built in SA, you will need a valid SAMSA CoF and the export documents for the boat.
If you do not come right with a skipper, give me a shout - I can deliver it but would not be prepared to live aboard/caretake for any length of time.