The trouble with all of this is the difficulty of collecting good evidence that will stand up in a court of law.
For example, if I were to be called as a witness, I would have to admit that I flew the Bae146 for nearly 20 years and retired at the age of 65. I am now 70and I am still (thank goodness) enjoying robust health.
As I have said on past threads on this subject, I have met a couple of people who have undoubtedly developed health problems and I sympathise fully with their problems but I think this is going to be a very difficult one to nail down.
The fact of the matter is that there were thousands and thousands of farmers involved in dipping sheep but not so many flying "smelly" aeroplanes.