I'd suggest these three men at least, if they were on a OADU flight to NA/ME then they would be classed as Killed in Action if lost, rather than Killed on Active Service, even if they crashed on take off.
These three men were published in Flight magazine as missing beleived killed in action:
TURNER, WILLIAM CHARLES Runn 5 (C) OTU* m/KIA
TURTON, EDMUND FITZWALTER Runn 5 (C) OTU* m/KIA
MARSH, RONALD Runn 5 (C) OTU m/KIA
http://www.rafcommands.com/forum/sho...-12-1942/page2
Each of them is on Runnymede and is listed as ex-5 (C) OTU which would have been a Beaufort training unit. Perhaps the Davidstow Moore site is a quote from a wartime ORB rather than based on research.
The 5 (C) OTU listings come from the GRO list of RAF overseas deaths.
or did 5(c)OTU loose an aircraft elsewhere that day?
And Ashton while he is buried in England, his death was registered in Redruth district, Cornwall and his name is listed as Killed in Action in the same casualty list as the men mentioned above.
I would tend towards these four men based on their KIA listing, if they crashed in a 5 (C) OTU aircraft elsewhere, I'd expect to see them as Killed on Active Service.
Ashton KIA, Turner, Turton, Marsh missing/KIA
These OADU men might appear on the strenght of their last training unit on death registers from the GRO.
The example of the Hudson FK522 shows the two RAF/RAFVR men as being OADU and 6 (C) OTU. Their was an Australian on board that aircraft so easier to determine the crew and pax.