One of the problems is that there's no trustpilot type feedback on examiners. I have no objection to one who fails a boat for not meeting the standards, but twice at least I've been forced into making changes (one extremely expensive) which were not legitimate, and once almost certainly conned into buying overpriced kit from the examiner to get a pass. Which, considering the thing only happens every four years, is pretty dire. That's almost a fifty percent rip off rate. Those three examiners have all retired, so you're safe...
I now have a choice of two, neither of whom I know, both having been used by members of this forum but understandably people don't want to make a public comment apart from the fact they've used them.