Probable Oxford serials
Laurence,
Here are the likely Oxford Serials. All these are listed as being delivered to Rhodesia.
BG170, HN237, HN342, BG364, HN367, BG445, HN518, LW930 & EB961.
I was unable to find a definite fit for ??253 & ??379 .
Hope this helps, M-62A