Fixx, thank you so much for that info; very helpful.
HDR: I do not do a lot but I did find when I used -2,-1,0,+1 and +2 stops I had quite dramatic results. On this bracketing, I used seven images from -1 to +1 in thirds, with less drama. But (i) the image itself is not especially dramatic and (ii) the range of -1 to +1 is axiomatically smaller than that of -2 to +2. Thus, I take your point as partially correct - viz it is the processing itself which adds drama. However, I suspect the range does, too - which is different from what I said before - so, yes, I was incorrect.
Apropos the RAW colour-space not existing. No, of course it doesn't. What an idiot. I shall hit myself with a foam-rubber tripod (one should not be too reckless). If RAW had a colour-space, it would not be RAW, would it? That was the colour-space of my brain-fade. Thank you for not calling me an idiot - though I have now done so.
Apropos final use: Need images available for professional printing for A4 through to A2 at least, perhaps even A1 if I'm lucky. I have printed a bridge camera's 16mpix output on A3 and it was grand, so now I am using a very low-end crop-sensor DSLR, at 18Mpix, I would hope to be able to reach A1. I hope to upgrade to a 24Mpix Crop-Sensor soon. (ie: Bridge - Fuji HXR; Present: Canon 1200D; Future: Canon 80D - or 90D?). I know full-frame is the tempting target but I can afford lenses etc easier on APS-C. Should I win a lottery, the Canon 5D and its lenses will be on my Day One shopping list. Sorry, I digress - anyway my printers like Abobe RGB, plus a load of other things in pre-prep before I send them the files.
I have, as you suggested, re-developed using Adobe RGB. Thank you so much.