The only way I can access my ntlworld address is by using a third party client, like Outlook or Thunderbird. I can't access it directly online any more, because it requires me to sign on to my Virgin Media account, which I don't have any more.
I'm not talking about my virgin email address. That has gone, and I no longer use it. However, I have archives on my ntlworld address. Virgin Media bought ntlworld some time ago, but I don't think they have the right to block an address that way.
Because I can't access it online, I can't close it, change the details or change my password. That is worrying, because it could cause a security breach through my other email accounts if Virgin is hacked.