Thank you again for the reply. I don’t even have a mu-plugin folder in wp-content.
I’m afraid I may not be the best at seeing if there is something in wp-config-php that doesn’t belong there. I tried to paste the content into this message, but was a mess so have linked to it in the text document here [removed by moderator]
As for site health, there is just one issue related to JetPack boost for an outdated critical CSS that is related to a plugin – I can make that go away if I disable the plugin, but of course, that doesn’t fix the original issue.
Thank you again