Well I can't explain what happened but I have got the library back again, see the screenshot to show the number of books. I have used the add books feature and added them from a copy I had made of the database on a usb, it's worked, but I don't know why they were removed. Could it have been due to a plugin update perhaps?
I definitely have the file locally, not using any cloud drive
Thank you for all your advice and help, very much appreciated
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