Reason why I don't install Windows 10 version updates as soon as they are out....
Doh!! I had recently changed my wifi SSID in order to get an IOT device to work, and I forgot that this would reset my "Metered Connection" setting. No wonder my computer keeps updating itself!
Thanks for bringing this to mind. I've just made the change, so now Windows should be at least a little more "calm" on my laptop again.