I've worked on several properties off this kind over the years, and the usual arrangement is that the supply pipe is buried all the way up the passage inside the door, to the kitchen, and is often still lead.
The main stopcock tends to be under a hatch just inside the front door.
In these cases, I've replaced the pipe with plastic all the way back to the street if lead, or from the old stopcock to the kitchen, fitted a new stopcock in the kitchen, wound the stuffing gland on the old cock wound right down, removed its handle and covered it permanently.