Well that was a complete waste of the last two days.
Multiple attempts to perform the upgrade and each time it failed and each time for a different error code. The compatibility check passed, the download went OK as did the check on the download. The update ran, the machine rebooted and - we're back to W7. Made sure all exisitng W7 updates were present; disconnected any unneeded USB HDDs and all the other little tricks mentioned on the internet. Still no joy.
At some stage in the proceedings the update managed to trash the user profiles for Ms Luggage and me. All I've got to do is spend the rest of the day working out how to do that. Thank you so much MS
So back to W7 for good now. Compared to the painless upgrades on my Mac and even my Linux laptop the W10 experience was shockingly bad.
I joked at work that I'd upgrade to version 10 but it might not be Windows. It's no longer a joke.