I googled Avro Oxford but it actually called a Airspeed Oxford.
Thanks for the info and pointing me in the right direction. Here is some more information I found out about the Oxford:
The Oxford, built to Specification T.23/36, was based on Airspeed’s commercial 8-seater aircraft, the Airspeed AS.6 Envoy. Seven of these had been modified for the South African Air Force as the “Convertible Envoy”, which could be equipped at short notice with a single machine-gun in a hand-operated Armstrong Whitworth dorsal turret, and with bomb racks.
It seems Bomber Command used them as training aircraft for the big bombers.