given all of the above info...
from the report, we are told he contacted ATC at 22:18 for clearance, and fell off radar at 22:22.19 (at 400ft).
given that from low fuel warnings you have at least 10 mins of flight time (or have I got this wrong?), he must have been looking at low fuel warnings before he contacted ATC?
do we take from this that he was unaware of the warnings?