Is your mailbox talktalk.net or tiscali.co.uk or lineone.net or another?
Password Reset details should have been set up for the email address so that an alternate email and or mobile number can receive a password reset. Please do try the Forgotten your Password option. If there's an alternate shown that you recognise from the hints, and have access to, then please reset the password.
If the self-help password change / recovery options aren't effective then I'll alert the TalkTalk Community team for you.
In the meantime, please update your Community Profile Personal Information (Click here) to include your name, current contact 'phone numbers and address with postcode (location) then scroll down to Private notes and add the email address and Save changes.