In reply to Neil (Glow O365 PM).

Hi Neil,
Thanks, yes, I *think* we had deleted and reinstalled before, but maybe just removed accounts and added again. I tried so many things that it got a bit confusing. At the moment I would not recommend onenote in my set up for anything you would be very upset about losing. We did lose data in the 'recovery'.
I am certainly going to be encouraging pupils to back up any important text locally in the notes app in case of further problems. Some have already mentioned that they don't particularly like typing in OneNote so I don't think that will be too much of a problem.