The only sites I tried were
www.ntl.com and
www.ntlworld.com.
It turns out it was a Proxy problem. I was using one of the old proxy addresses in Southampton. I found the list of new Proxies on this site

, Picked one in Winnersh and it's working fine now.
Why don't NTL announce these changes on their help site? Do they expect us all to be using a single PC connected directly to the cable modem with Auto Detect selected