@Kezo, I’ve got a cable to go from the router to the BT wall socket but it didn’t work. I opened the BT wall box and discovered the Openreach engineer disconnected the alarm. I’ve now got to figure out which of the two alarm wires go where. There are 2 cables 1 blue and 1 white and the sockets to behind the BT faceplate has 3 hole numbered 5, 3 and 2. Do you know what colours go where?
Enyaq EV