This morning TalkTalk are having a big outage which is in turn is making any EoFTTC or Leased Line from them unavailable.
We apologise for this problem and are assured TalkTalk are working to fix the issue as soon as possible,
We will update you here once we know more.
Update 09:13 27/11/2017
All lines have come back now and the problem is gone.
Apologies once more for this issue.