Ticket 593738 (from the status page for national loss of email) was only affecting Knowsley regions (ex-Telewest).
This was related to pop3 downloading of mail and has now been resolved; this would not have affected access to the ex-NTL ntlworld platform.
Webmail via
http://webmail.ntlworld.com/ is working fine (I have just tested it). This may however be an issue with your account.
You could check to see if outgoing mail is ok, this will confirm connectivity to the server as there is no authentication required. You will possibly need to speak to CS in the morning to perform a password reset if you can send but not rcv.
Good luck.