Thank you Nick and Benny

Yes that is the problem I was finding. The workarounds are a good idea and may help find other underlying problems so must remember

(quote-Benny)
"A quick way if you do not want to navigate the GUI to find who this note is attached:

1/write down note id
2/export to gramps xml your data, and extract the xml file in the .gramps zip  (open with ark, or unzip, or file-roller)
3/look for note id in the gramps xml (one CTRL-F)
4/copy the handle of the note, then search on the note handle in the xml (another CTRL-F)
5/you now know everything this note is attached too."

Please consider topic closed.
Many Thanks
C4