Regarding traffic, I recall my first ever flight in December 1965 was VC-10 (not Super):
LHR - CIA - NBO - JNB
As I understand it, the machine could have done NBO without a stop? On other occasions is was EBB for the bounce.
I would agree with earlier posters that the VC10 did not go on to CPT, you had to change on to SAA at that time.