Did not want to quote your entire reply, but thank you for the whole thing. It is likely to become a bible. I still feel a bit like a novice driver given the keys(?) to a formula one car - but now I have a pit crew and medical staff standing by
I think the most biggest single mistake (amongst many) was the mixing versions in my repos. So I’ll be particularly cautious of that. Plus the home and factory repos are clearly intended for others - they will be off-limits.
Thanks to everyone who contributed - must be exasperating to deal with blundering fools, but you were all very kind.
