going on since tuesday at least. website was down on tuesday, their pop/imap "email" has not been working correclty either (i have customers who use that shit unfortunately)
oh, and one of my customers said that shortly after contacting (genuine) talk talk on 2 occasions recently she got a call back soon after from scammers pretending to be from talk talk.
on the other hand, not sure how you differentiate scammers from talk talk they both seem to do the same thing.