I have left my router switched on overnight to see if that made any difference. At first, I thought it had when my periodic speed checks gave a download speed of 3500+ Kbps all day yesterday (14th). However, today is a different story. My current results, although not quite as bad as earlier when I first started this thread, are certainly very poor and not at all good value for money, especially what I am paying at the moment. Incidentally, it does not make any difference whether I plug the phone line into the socket that I usually use or if I plug it into the test socket at the main point where the line comes into the house.
These latest figures have decided it. I had thought with my results yesterday that things were beginning to look up, but I am not prepared to put up with this poor performance any longer. As soon as I receive my MAC code, I shall change ISPs.