"I am surprised that the Openreach technician did not check that it was working, before they left."
As the OP mentioned, the hub was not available to the Openreach technician when he set up the line, because the OP had not yet brought it to the new house.
Still, I'm curious to know what the technician actually needed to do, unless the house was new and previously unoccupied. Did he have to fit a new master socket?
