Tom
It seems to me from your reply that you think I am trying to create a new account "from scratch".
I am trying to create a third secondary address to add to the previous two created about ten years ago.
Yesterday I cleared all the Virgin Media cookies from Firefox, and that time the "Updating" window had a red circular rotating rotator, which continued "forever", above the "Updating" word.
Today, without clearing cookies, the window has a blank area just above the "Updating" word, and, again, nothing further happens.