The domain expired. Because it’s actually bought from a third party service, I didn’t get an email from Modwest, who host the web space for this site. I probably did get a warning from the company in question, but no doubt deleted it as spam. And then the site vanished, along with my email, for 36 hours.
If you sent an email to me in the last 2 days please send it again.
Currently not happy with the whole system but time to move on.