An auto backup has been performed this morning. So that's a good result, and has solved my problem. Thanks for your help.
But, an observation. Interestingly, my list of available backups to restore has shrunk considerably - 2 from 2012, 3 from 2013, 1 each from 2014 and 2015, the manual backup I did the day before yesterday, and this morning's auto backup. The rest have disappeared from the list. Wierd. Perhaps the fix-flash-packages performed some sort of purge, or has an unexpected housekeeping process taken place.?
Unless you advise otherwise, I will delete the old backups and just keep the last two.