As I am no longer working for ntl I have no way of escalating these issues. The thread was created for this purpose, and thus it will now be unstuck and closed.
If anyone else in ntl wants the fun job of escalating proxy issues PM me and I will reopen the thread.
I will stick a thread instead which details sites that regularly have issues with ntl proxies, with links to the articles with information about how to resolve these.
EDIT: the new thread is now running
http://www.cableforum.co.uk/board/sh...ad.php?t=32161