Thanks for the tip, I was updating the iOS as you were replying. That seems to have done the trick (aside from one note that was showing that had been moved to a different Notebook!) . I will remember the revoke devices tip just in case.
I tried a reinstall and it made no difference. I get timeouts on synching and can't see my notes. Reduced to using my Windows phone which works fine. The app worked fine as it was and now doesn't at all. *****.