Regards, Martin
Disable the node red companion integration and restart. The delete option will then be available and you can delete the entity. Then re enable the nodered companion.
Okay. Done that…
Hmmm… Where should I be looking?
If I go Settings | Devices & Services | Entities, I see the two Node-Red entities I want to delete. Clicking on either brings up the History/Logbook pop-up. However, clicking on the gear icon in the top-right (settings) shows this:
Unfortunately, reading the “documentation” does not leave me any wiser 
Looks like it’s corrupt. Try adding the spook integration. Re enable the NR integration and run the action to find orphaned entities. It will give you a list of everything that is orphaned.
Check the list for anything that you want to keep. If it returns additional orphaned entities. Then run the remove orphaned entities action. If there are entities there you do not want to delete, you’ll need to edit the entity config file by hand.
Thanks, that fixed it. I think…
The Spook “list orphaned” still reports more than 150! evry time I run it. But I don’t know if that is an un-cleared list or there really are still that many.
Regards, M.