The horrendous problems thrown up yesterday have eventually been fully identified and resolved today, after much hard work by myself and another person.
I am so relieved.
Today was still a hard day, but manageable. I have now regained some of my equilibrium and most of my sense of humour :-)
DH had to finish work early and drive home to Wales this afternoon as the weather at his place of work deteriorated significantly with heavy snow and much more forecast in the next 24 hours. He was worried that he might not be able to get home at all if he didn't leave when he did. He got home safely, for which I offer up heartfelt thanks.
Of course, we have no snow on the ground at all here, though light snow is forecast for the middle of the night :-)