Pretoria is not on your list of requirements, but thought you may be interested in this.
Air Vice Marshal Sir Theodore McEvoy Assistant Chief of the Air Staff (Training) visted 5 FTS (RAF Thornhill, S. Rhodesia) some time in 1952 - 1953 and arrived in this Devon that I photographed at the time.
ISTR he flew up from Pretoria in South Africa and I assume this is the Devon used by the AA in Pretoria at the time.
Serial is not clear, but possibly WD 533?