Tony,
As practically all flying at OTU's was connected with crew training (NOT operational) I think you are right to generally assume that he was involved in a training accident. However OTUs (and particularly Bomber OTUs) were very occasionally employed on operations (such as the 1,000 Bomber raids on Cologne, Operation Millenium, May/June 1942) as well as some special periods and circumstances involving putting the pressure on U-boats in the Bay of Biscay, which I think involved Wellingtons, Whitleys and the like. Another small point is that RAF and other British Commonwealth OTUs were generally referred to as No. x OTU rather than OTU x, and if referred to in a formal sense, then ALWAYS that way, as with Squadrons, schools, etc.
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