Mooly said:
Thanks for that link ThrashZone. I've sent a support case in... and they say they will reply within 24 hours. Fingers crossed.
Had a nice reply but it seems I have to wait 30 days. To be sure we are understanding each other I've now sent the screen shots of W10 back and specifically said that it seems to be the OS that is tied to the old email account.

Just have to see what happens...