Loads of big sites aren't working for me from different UK isp's and through proxy servers, something weird is going on.
im on BT. which isp are you on and what sites are not working?
BT here also, ebay, twitter, a few big forums I browse, have tried to access them via o2 3G and no go also, sounds like a DNS server issue although it's strange that BT and O2 (3g) are both effected.
EDIT -
I can access them via http://hidemyass.com/ so it has to be a DNS issue.
have