We are seeing an issue where TT lines are failing to connect - this is not impacting lines that are currently connected unless they drop and reconnect for some reason. This looks like only half of TTs LACs that is impacted, and so lines are eventually reconnecting after several tries.
Talk Talk engineers are working on the issue now.
TalkTalk have raised an incident and are still working on resolving this.
A few lines have logged back in, no word back from TT yet.
It looks like all lines are back, we'll update this post again when we get further news from TalkTalk.
Update from TalkTalk regarding this outage: "Investigations by our NOC and network support team identified that a routing card had failed on a router. Routing functionality was moved onto an alternative card by our network support team to restore service. This was completed at 11:46hrs and monitoring has not identified any further issues"