Well,
geoffwba7, regarding your question about rolling back your W10 version to pre-1703, no matter what you do there, we recommend that you should first backup all your personal data on that computer to external media to avoid irretrievable data loss before proceeding!
Not sure if the Creators Update made the same 30-day uninstall provision that was in earlier versions of W10 (v1607, v1511, v10240) or not. Others here may have tried it or heard about whether or not it's still available in the new version (v1703). If it's available, and you haven't deleted the windows.old directories, that option might work for you.
😉
Really, the most important thing is to realize that the entire upgrade process is "sketchy" at best as kemicaly rightly states it. Many hundreds of us W10 Insider Testers have seen this over and over again in all versions of W10 going back to 2014 prior to it's release, and Microsoft has a cleaner upgrade process, but it is certainly less than perfect, and often causes more problems than it fixes.

Clean Install is still the way to go.

In the future you may wish to turn off your WU and WUDO settings or change to a metered connection so that future major updates don't cause problems with your computer.
If at some point, you take all the necessary precautions for data backup and you wish to upgrade to the latest version of W10, you have the ability to undo the problems coming from a faulty upgrade and not lose stuff. Bear in mind too, that if the PC you have is not a clean-running machine and you've not thoroughly tested your hardware, the Upgrade process often fails in either or both cases. For most users, this is the case and very very few home users have a clean running PC or have paid a Tech to go through it right before attempting the W10 upgrade.
Some thoughts for you to consider.
Best of luck,
<<<BIGBEARJEDI>>>