Further to my original post and all attempts to stop Copilot from operating, while preparing an important document that I cannot have any form of AI being associated with, this just popped out of the blue. 
It was accompanied by a range of options.
Despite everything I have attempted, trying to follow all sorts of 'instructions' that refer to things that cannot even be found, Copilot is actively involved in my Word document in progress. Nor have I been able to make this thing even go away.
Microsoft have enacted AI in its suite of products, not told users anything about it and have not even given us a working option to stop it from interacting with our work.
Anyone who works in formal research, security and other things that cannot have AI involved, has been royally shafted by Microsoft, who refuse to even discuss the matter down here in Australia.
Frankly Microsoft can go **** themselves. And to think I have been continuing to pay for this alleged 'service.'