Ah, the late Ken FitzRoy wrote about taking RAF Brits down to Lusaka from Nairobi during that period, ferrying fuel and other sundries as I recall. Turning round at the far end of the runway after landing to see a BOAC VC-10 doing the same at the next turning circle.
I think 66 is indeed the year.
If you can find Ken's book "No Time on the Ground", it's a super read.
Great pic, thanks!