New
#11
Many thanks for the replies. However, the problem now seems to have sorted itself out.
Following on from discovering the problem on 12 November I changed the time between saving copies and a check today shows that File History had started working again from that date. To confirm it I carried out a little experiment by changing the time between copies to 10 minutes and resaving a test file every 15 minutes or so. "Recover previous versions" now showed all of the versions.
So, I believe that whilst the problem started with the Win 10 Fall Creators Update - the date and time seem too close to be a coincidence, I am now reassured that the problem was peculiar to my PC and that any suggestion of MS shutting File History down with the update was a complete red herring.
Anyway, thanks again for replying.