Thanks for your support and answer.

Looking at Galileo I see:-

JNB-FRA 3rd Jan - F2 A1 C9 D9 Z9 Y0 B0 MC HC

I had hoped that with so much availability in Business I stood a chance of getting an award but it was not to be. Looking at KL, BA and VS during this time paid availability is poor but there are occasional reward dates popping up.

Yesterday my Girlfriend managed to get a great deal EDI-FRA-CPT-(surface)JNB-FRA-EDI in Business for £1600 including taxes. I'm flying to CPT on the last Intercontinental leg of an oneworld Explorer ticket. If I cannot find a reward flight I will book at paid flight however, the cheapest one-way I can find is around £1800 (converted from ZAR), £200 more than my GF is paying for a round trip!