Have you tried accessing your mail via an email client, such as Outlook Express or Windows Mail? (Unless you're normally accessing your mail while away from your own computer that should be your preferred method of access anyway).
If you've not already configured your email client for TalkTalk mail, instructions for Outlook Express are here:
http://www.talktalk.c...-outlook-express.html
(The instructions for Outlook are basically the same).
Instructions for Windows Mail are here:
http://www.talktalk.c...-in-windows-mail.html
Chris