Through the telephone line? NTL don't use telephone lines to carry BB so you wouldn't be able to do that, have you got a BT line anywhere in the house? If so you could try for ADSL on the BT line.
Aside from that you can pay for a second STB and get that enabled for BB instead of the one that is feeding the router now.
If you are looking to set up a server for commercial purposes I would suggest getting a commercial BB account instead of a residential one
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This wouldn't happen to be you would it?
http://jp-ukproductions.co.uk/
since you appear to be offering hosting
http://www.tvforum.co.uk/forum/viewtopic.php?t=15242