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Thanks to all - I don't know if I've missed any messages but I can rarely offer useful advice. I can get through on the second try as I said.
By the way, I just got a bad gateway message again, and I haven't got a back button (I assume that means an arrow in my browser that lets me return). It's OK, I just opened the site again and it went well.
Just out of curiosity , kept a scoreboard over a seven day period.

Saturday , 10 March to Friday , 16 March ... 17 recorded.

On Firefox / Windows Vista / JPROSILVER , refreshing the web page cures this annoying problem.

Day 61 since the this thread was started ...
I get them occasionally and randomly, but a refresh solves it