All looked ok when I went to sleep at about 6am, but appears to have started having problems from about 8:30 onwards with intermittently waiting on some network resource.
Problem looks external to my server and the server’s support staff are chasing it at present. It is intermittent so hopefully this post will display.
If it persists for too long, then I’ll switch to a backup server. But I suspect they will find it shortly. In the meantime I’d better head off to work.