Hi Andrew, I don't know the details for the AFDU structure I'm afraid. I I've seen AFDU Trial reports for the Manchester, Halifax and Lancaster. I can't find a solid reference, but September 1943 might tie in with Bomber command trials of camera gunsights for fighter affiliation. Later, there would also be trials for gyroscopic gunsights and for AGLS. AFDU may well have been involved with these.
Richard
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