have you tried using internet explorer to just ftp into your webspace to see if it works.
if you haven't try this
open internet explorer in the address bar type
ftp://username@upload.ntlworld.com
username being your original ntl issued username, changed ones or second email address names don't work.
when prompted enter your password
again only your original ntl issued password will work.
if you get a blank webpage and no errors you should be in and can now use copy and paste to transfer whatever you wish into your webspace.