Yo, registered just to post this.
I live in Exeter, have the exact same problem as you guys are reporting. Just for the record, I had to set both my PC's MTU to 1492 as well as my Netgear router's MTU to clear all my issues since Friday.
I can now get everywhere without using the webcache.
http://www.dslreports.com/front/DRTCP021.exe (to change Windows network card MTU)
NB. Be sure to reboot after changing your PC's MTU.
HTH