All seems well again. I don’t actually know what the problem was or how it was fixed. However it was probably me as I was doing something strange at the time. I had messed up some pages while editing using Front Page. So I was backloading from the ISP’s server to my computer. Thinking about it I probably exceeded a the daily data transfer or something If I have the time I’ll look into it so I don’t do it again.
The editing I was doing was to try to make Classcal Gas look right on Mozilla Firefox which I have started to use instead of Explorer. More later.