Well let me think about that.
First, BGEngineer, you're not an Engineer. BG may have told you that you are, but you are not. It would be nice if you went away and did a bit of research about what Engineers and Technicians do. It would prevent people thinking that you're an idiot by making a statement that makes it clear that you know bog-all about engineering. A Corgis/Gassafe ticket does not make you an Engineer.
I have some old printed gas training notes, a wad of paper maybe an inch thick; there are sections that I knew already, others that I could read, digest and learn, nothing beyond simple fundamentals. I recently had the college notes of a late relative, who was an Engineer. It was a stack of paper, hand-written, double-sided about two feet high. I doubt that there were two pages in it that I could follow without having to refer to textbooks on calculus, fluid mechanics, stress analysis, etc., to understand the reasoning. He had attended university after his apprenticeship; I think he transferred and didn't finish the apprenticeship.
Secondly, BG are incompetent. You may not be incompetent, I don't know you, but you do as directed by your Directors. I won't go into the details but BG made a monumental cock-up some years ago which endangered me and my family. It's all in writing, I have kept all of it. They defended their unsafe working practices. I didn't know much about gas then, but I've learned quite a lot since. I wouldn't be inclined to trust any Corgi/Gassafe technician, certainly not an ex-BG type. Some prove themselves to be competent; some confirm my worst suspicions at every opportunity.
Third, the trade knowledge which you want to be kept secret could be learned in, I'd estimate, 3 months by some one of reasonable intelligence. It's no big deal, so stop trying top make out it's some scarey, top-secret esoteric wisdom. It should be freely available to anyone that wants to make the effort to learn it.
Fourth, the reason unqualified people try to repair their own gas appliances is because they can't afford the BG/Gassafe prices and they do not trust domestic tradesmen as a result of consistently being ripped off.
