Hi. I have recently received the email about the end of free email. I have tried to add a talktalk.net - to my account in preparation for the deadline, but despite several attempts I have been unable to. I get the error message "Sorry something went wrong and we were unable to add the TalkTalk email. Please try again later." and sometimes it looks like it goes through because the page reloads, but the new address isn't added.
I had to 'unlink' my talktalk email address from my account, I then added it as another address in my account, first time I tried it didn't work but after trying again later it did work, hope this makes sense.