Genghis proposes:
"There are several historical incidents where following a high energy jet accident, the pilot had no recollection of the accident and period around it. Not to say that this will have been the case here, but it's possible".
Yes, and this effect applies to many types of heavy trauma episode, train crashes, car crashes, war and so on.
I believe the Police have no business to be first in line to interview. They should defer to the AAIB who are probably better equipped to do so and have a more urgent need. [There might be an urgent need to issue a notice to all Hunter users].