Someone's ears must have been burning in Seattle last night, when I booted up my PC this morning, there was a page on the November update , open and waiting for me in Edge. It took me to this page.....
https://support.microsoft.com/en-gb/help/4020089/windows-10-in-s-mode-faq
W10 S which cold be where my problem lies.....
Next time it installs, I don't hold out any hope of stopping it, I will turn off the S mode and see what happens.
Wish me luck LOL