In the Uk I would say 99% of all operators of ex warbirds in the Uk are rigorous in their attitude and working practices, I know there have been a few issues, but the CAA seem to work to a higher standard than most... Hence no Lightnings flying here.
The trouble is no matter what the rules, you will always get the good, the bad and the damn right ugly, the problem is recognising the ugly and dealing with it, unfortunately you often find they are very good at throwing up smoke screens.