Originally Posted by Dave Noble

exc tax

MAN-JNB/CPT round trip , GBP1658-1858 O class , GBP5238 A class

Doing one way O class, the other A would be (1558+5238)/2 = GBP3398

Minus the GBP1558 already paid leaves GBP1540-1740 extra to pay

To to just the final leg in 1st would require 3 x 1 way fares ( or paying for 1st class the whol of the return trip and just doing a voluntary downgrade to business - which would be silly )

Buying 3 x one way fares will cost more than just upgrading the whole ZA-UK journey