Just out of curiosity I just did my own test.....erm....didn't expect that! Done at 5:45am in Bo'ness near Edinburgh. Thought you guys might be interested.
I'm away tonight but I'll test again tomorrow to see if it's permanent.
http://www.speedtest.net/my-result/4278537662
EDIT: Damn, why did the pic not show? Anyway D/L is showing 307.48