If anybody is subscribed to the broadband + Xbox live service from NTL, there is no option online to request this as an upgrade. I was upgraded to 2Mb but could not connect to Xbox live (and vice versa), as I was automatically upgraded to standard 2Mb service. NTL broadband guy suggested this was a slight oversight on NTL's part.
Mention this when upgrading to get the correct package (two IP addresses, etc.).
Hope this helps
BTW very pleased with upgrade. Thanks NTL