I have an 8MB connection and have had issues with speed for some time now. So much so I've been on to my provider a lot lately. This is the worst time of the day for me when my connection is at the slowest. It's much faster 12hrs from now in the morning.
My provider advised me to use http://www.kbps.co.uk/ to test my speed and both sites are giving out the same data.
Heh, just shows how bad my connection is at the moment :(