Dear peradua
First I did not sit on my hands.
Second this site strikes me as odd and difficult to navigate and I couldn't find anything of value on talktalk using various search methods. I have struggled through other information you have provided and been given the distinct impression by those that know better than me that talktalk is quite sound on security and in any case any problem would only impact on the talktalk site something you acknowledged in a reply to me. All I do with talktalk is pay by DD and if that went haywire the system would stand by the DD promise.
Regards
Fedora