I couldn't leave it alone so contacted PC Specialist who, after 3 messages from me to read my question properly, (they suggested rolling back to W10), they came up with this suggestion from MS regarding update issues back in W10.
dism /online /cleanup-image /startcomponentcleanup
I tried it without holding out much hope, as I have spent around 20 hours with failed updates, but at 90% it didn't blue screen as normal but continued to completion.
Thanks to everyone on here for your assistance. If anyone else has problems installing ANY windows updates, run the above from your command line. Don't forget to run as administrator.
Someone on this thread mentioned dism before, but I was so loaded down with trying different suggestions, it went by the by.