It doesn't really matter what walk of life you're in, no one is perfect and at some point one day you WILL make a mistake which is serious, we all will do this as we are humans. The best you can hope for is that A: you discover it and rectify it before any damage is done or, B: that in the event of failure, it does not injure or kill anyone.
Yes Colin, a mistake on your part could be very serious and one with the worst implications but should it ever happen, I am sure it will follow normal proceedure in your case as with any other. Everyone will point the finger and come at you with a length of rope... but.. you will be given a chance to explain and there will be an investigation and possibly a trial and only then, if found negligent or guilty of malpractice, will you be hung out to dry. I am sure thats eaxactly how you or anyone would want and expect it to be, rather than have half the nation baying for your blood on the say so of media reports.
I like everyone have made mistakes in my working career, I worked in radio and tv, aviation and the oil industry and remember well some of the mistakes I made and how I managed to spot them and rectify them before they had a chance to become a risk to anyone. I also remember how incredulous I was that i had even made those errors because I knew what I was doing, I had after all been trained ....