I've an Vivid 100 broadband and my speed is a little bit far from the optimal...http://www.speedtest.net/my-result/5917602722
Postcode: WN7 1XF
I checked my cables in the house with Fluke, no problem at all. Now I've changed into modem mode and using an Asus RT-N18U like a router but the problem is still here.
Type WN7 into the search bar at the top of this page. Plenty of posts to be read about the service (Or lack of it.) in your area.
Today's test result. I've checked and my contract is over, so bye-bye virginmedia. After 7 years, without any late payment you lost an another customer.