Hi Ben, sorry for the vague description.
Yes, I'm able to still edit other points added in a previous session.
The .xml file contents are all commented out, so when I use the widget straight out of the .zip file, nothing is actually visible in the widget. It opens fine, no error, but the widget is just blank, so can't add or edit anything. I uncommented everything and tried change true to false for some settings but still can edit points added in previous sessions.
So it works/runs with no errors, but just can't get it to restrict editing points from a previous session.
THanks again for the widget and the help - will be excellent to get this working
Steve