If there is already a drop-wire from the telegraph pole to your house , but no ‘master socket’ on the inside , then the Openreach installer may replace that wire and do a full install, or may reuse it and reinstate the service with a ‘new’ socket and partial new wiring.
If the previous occupant , for some reason , removed all the internal wiring and socket ( assuming no socket exists ) don’t sweat it, no reason to think it won’t all be replaced , problem free.
