I have been having speed issues with my 20 Meg feed since January and although I have reported 4 times all I get is we will escalate the fault (Network issues)
Today I found out that my UBR is one those that has been on the STM trial and although I have never triggered STM, the service has been awful.
If your area is on this list you may have the answer which appears to be that what is intended to improve for the most against the few, breaks the system for everyone
http://allyours.virginmedia.com/html...fficTrial.html