Paddy,
UCL tested 27 pilots and all 27 pilots had the same problems.
A 100% hit rate.
Normally one might expect everybody (pilots and cabin crew) to have their blood / fat checked, but in the world we live in the study was stopped abruptly.
Does everybody agree that it is not unreasonable to check the pilots blood / fat for contaminants after such an incident?
I can assure you, the AAIB do not agree.
By the way, I am totally on the pilots side.
DB