Recently I bought a new chordless telephone. No problem as it worked perfectly. However when I came to use my computer I found that the broadband connection speed had dropped to about 2.4Mbps. About three months ago it had risen from about this figure to 6.4Mbps where it remained steady. Having dropped to a low level again it varied between 2.3 and 2.8Mbps and once jumped to 6.7Mbps but didn't stay there. I then found that I hadn't connected the new phone's connection via the filter I had used before although the computer's filter was still in place. Now, for what it is worth, connecting the phone again via the filter has restored broadband to a respectable and steady 6.2 - 6.4Mbps. We live in a fairly remote country location and our small exchange is about 300 yards away. It may be that some folk living in country locations aren't using filters in their phone and computer connections, with detrimental results to their broadband speeds. It may be worth their putting in filters. This is just a suggestion which may perhaps help with what appears to be a fairly widespread problem. I may be quite wrong of course. Comments would be welcome.
Thank you for your comments. Obviously most people are aware of the need for filters as I am myself. In this instance my mistake in leaving one out of the circuit highlighted the fact. My reason for mentioning it was to underline the fact to a small minority who may have been unaware of it.