@AmigaOne
What kind of STB do you have from NTL ?
Can you link to pictures of the ports etc that are on the box?
How is the PC connected to the box?
I use a
Draytek Vigor2200USB router that is connected to a USB ADSL modem. They now have a new version with the modem built in.
I don't know if any of these are compatible with your setup. If they are I recommend them.