My apologies. I have just discovered that no emails are being sent from the site. I appreciate all those who took time to comment. I was unaware of this. I am trying to debug the issue.
Update (26 July 2025): I hope that this is now fixed.
Update (28 July 2025): Apologies for the errors on posts with comments. The footnote plugin has not been updated for years, and it seems PHP 8 is a little stricter on variable declaration. I’ve fixed it, I think.