Some TT lines are down and they are aware and working on it.
From TT at 20:47... Following initial investigations conducted by the NOC it has been identified that there are a number of Virgin Media Backhaul circuits down, this has been reported to Virgin Media who have an engineer on site at Hammersmith and another engineer en-route to Ealing. The cause of the loss of service is yet to be determined by Virgin Media. We will provide a further update as soon as more information is available. Summary Network monitoring has identified that a number of Phone, Broadband, TV, B2B, FTTC, AOL and TUK customers in the West London area are experiencing a loss of service. Impacted customers will be unable to use Phone, TV and/or their data services for the duration of this incident. The full list of impacted exchanges are still being collated. However, impacted exchanges identified so far are Hammersmith, Fulham, Nine Elms, Bayswater, Earls Court, Pimlico, Chelsea, South Kensington, Kensington Gardens, Shepherds Bush, Battersea, Belgravia and Sloane.
Update from talktalk:- The NOC have completed their checks and have advised that all of the affected customers have now had their service restored. They have liaised with Virgin Media who have confirmed that they have completed all of their restoration work. This incident will now be resolved awaiting confirmation of the full root cause, which will be communicated out once available.