Thanks QDM
Thanks for your honest reply, It is exactly the answer I would expect from all pilots.
I am sure the majority of pilots would be incensed that an item had been left in their aircraft, & would have made sure it wasn't left in the aircraft.
I believe this to be true in this case. Alas we will never know exactly what happened, All we do know is that it is a great tragedy which cost the lives of two brilliant pilots & must never happen again.
Thanks for all the discussion.
pspf.