Is you broadband running slow, dropping out, and generally not delivering the service expected?
It could be that the line is suffering from Repetitive Electrical Impulse Noise (REIN).
This can originate from almost anything, a low energy light bulb, TV, computer, boiler clock, a Sky box, freeview box, and endless other things.
Often it will be as a result of a poor switch mode PSU that is failing. They produce electrical noise right in the ADSL frequency band!
The noise can be devastating. The exchange equipment will reduce the line sync to compensate for the line dropping, and before you know it you have really slow and unusable broadband.
So what can you do - search for sources of REIN. It could be in your house, or that of a neighbour.
Check out the link above, and also this useful monitoring software.
You may be able to work out a pattern. Try turning off the various mains circuits in your home. Take a radio on 612kHz and check for noise.
Once you find the source of the noise, get your ISP to retrain your line to restore your speed.
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