What a good app YoWindows is. Thanks for the heads-up Beagle.
Re Windows 10 updates. I first loaded W10 on an older W7 laptop in September and ran with it for two months until I got used to it. All fine. I then 'accepted it' onto newer W8.1 laptop and that was fine as well, although there were subtle differences between W10 on both.
On the morning of 2nd Jan, older lappy announces it is going to install updates in 10 minutes - wait, or install now. Accepted 'now' and after a frozen blue screen with no hard drive activity for 45 minutes saying 'installing updates, do not switch off your PC' and with a completely frozen machine, I did a hard reset. On boot-up it then proceeded to re-install W10 from scratch. 1 hour 50 mins later I had exactly the same W10 on both computers with no issues, other than a few expletives about Microsoft.
Whether or not this was due to my impatience I'm not sure. I was expecting a patch to be installed as you do, and with absolutely no hard-drive activity I felt sure it had locked up. You live and learn I suppose and clearly they're still tweaking W10.