I moved home and had BT Infinity 2 installed, phone line enabled same day. The house was built in 2007 so has extensions in all the rooms. Looks like the master socket is in the cupboard under the stairs. Although the previous occupier obviously had the openreach modem and home hub located in the lounge, as the mounting screws etc were still there. Here none of the extensions work, the engineer said this is a side effect of moving the master socket. But why was this possible in my previous house?