S76Heavy & BHPS,
I'm not a legal-beagle and don't have any in depth knowledge of corporate law, but, I am sure I am correct in saying that should the pilot feel unfit to fly for any reason, such as stress, then he/she is duty (lawfully?) bound not to fly. Don't ask me where it's written down as I don't know, perhaps someone who does will post. Anyway, if what I have said is true, then any incident that was proved to be caused as a result of the pilot suffering stress, the authority, the company and the customer would blame the poor unfortunate pilot concerned.
Chopperman.