A couple of months back I had a decorator working in my house. He told me his father in law had been on 617 Sqn in 1944. The following day he produced his logbook and DFC. He was a W.O. bomb aimer and had flown on two raids against Tirpitz; the first was unsuccesful and they had operated from Murmansk. For the second try his logbook was annotated "one Tallboy - direct hit" for which he was awarded the DFC, or at least he received it shortly after. He seemed not to have flown again after the end of December 1944. By that time he had completed one and a half operational tours. Neither my decorator or his wife knew much about the man as he hadn't spoken of his wartime experiences and this information came to light after he had died.
He had entered several holiday flights in his logbook, naming the captains, coincidentally a couple of whom had been colleagues of mine. I suggested that the current 617 guys might be interested but whether that was acted upon I don't know.