I don't really know what to make of this. The domain v3.co.uk definitely seems to be unresponsive. If (for example) I try to ping it I get this response:
eric@songthrush:~$ ping v3.co.uk
ping: unknown host v3.co.uk
So at the moment, even a DNS lookup on the site fails for me. I suppose that it could just be that the underlying problem has been fixed, and DNS propagation is not yet complete. That might explain why TD gets a response but others don't. But I'm fast exhausting my knowledge of the subject.