As Black is now a live - it does seem sensible not to use it as a neutral.
I think we need to sing from the same hymn sheet, so to speak - so I will stick to grey=N and black=E. If everyone does the same, all is sweet!
The production of a single phase 3 core SWA would seem like a natural progression - I fear cost will prevent this, but we can only hope. (Brown, Blue & GreenYellow) But then, with this floating around, how many people will bung it in and use the cores (including GY) for another purpose such as a switch drop or a 3 phase supply
I can see it now - ah look we have a little left over.........lets use it for this machine......