Same here in N4 area. Did not notice a flash but no internet, no tv and none at the end of 150. Call, automatic voice saying they are experiencing high volumenof call and cut off. Status page not working!!! No one on Twitter Usual VM service when things go wrong
Sorry for the loss of services you experienced. I can confirm the reason was a major power outage at one of sites in the Haringey area on Saturday that was fixed at 19:03 on Saturday night. All telephony, broadband and TV services were down till at least 19:03 on Saturday.