Do you have any of the TT filtering options enabled?
Can you post a traceroute?
Yeah I can ping and tracert the site fine.
I am on the business package, so I shouldn't have any filters applied?
Also I was a nildram customer back in the day until they finally got bought over by talktalk, so I don't have the portal access normal talktalk customers do.
Having the same problem here on standard Residental TalkTalk package.
Right think I've cracked it, its to do with MTU max size.
Ruled out it being a browser or O/S issue as happening to multiple devices on same network. Then ruled out DNS as tried several others (google, OpenDNS).
Having a nose around it seems by default your TalkTalk MTU setting should be 1432 which is pretty much a max size (unless on fibre). If any network link on the route is unable to pass messages of this size you get the issue we have been experiencing.
I've now lowered the value to 1400 and all is working