The Canadian was probably Sgt. Nicholas Clayton Rushton of Calgary, Alberta, 41 years old, as listed in CWGC but with a death date of the following day, possibly from injuries? At that age he was probably an instructor. Couldn't find his death registration in Canada but you could send to Ottawa for his file and it might have details on the crash. You would probably need more than the standard "genealogy package", however, which involves a copying charge.
G.D. Coldwell-Horsfall 127257 RAF is listed in the PoW pages on this site as being from 12 OTU and captured 15 May 1944. No mention of which camp he went to, if he in fact did spend time in one or was possibly liberated shortly afterwards.
http://www.rafcommands.com/Air%20Force%20PoWs/RAF%20POWs%20Query%20C_1.html
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