Jayteeto, If I gave the impression that I knew the cause of the accident then it was the opposite of my intention. It was simply that this thread seems to have moved away from considering possible causes.
Regarding fuel I am, of course, aware of the layout of the tanks and pumps as clearly explained in earlier helpful posts. Beyond that I only know is what the AAIB have published.
SilsoeSid, thank you for your constructive suggestion. Please excuse my ignorance, but in what circumstances would a pilot need to chop both engines?
Like you, I remain baffled at the facts as published by the AAIB.