A few NTL users are proving as painful as AOL has hitherto been. NTL puts *everyone* behind huge regional proxy servers, 100k+ users all showing the same IP. This creates endless fun with blocks, as you can imagine.
However, it appears the proxy does send the user's real IP ... encoded. See http://en.wikipedia.org/wiki/WP:ANI#Please_do_not_block_User:62.253.96.42_.2... and the mailing list post linked from it, http://lists.horde.org/archives/imp/Week-of-Mon-20030106/028895.html and the official NTL proxy list with characteristics, http://homepage.ntlworld.com/adf/ntlproxies.html
It would involve coding for a special case, but it's a special case of the largest cable ISP and second largest overall broadband ISP in the UK ...
- d.