If the Engineer is not to locate the Modem and Hub at the Master Socket, he will need to know where to run a cable from the socket to the final destination. They have cable up to 30-metres. Looks like a slightly thicker phone extension cable.
I believe they will not relocate the Master Socket, they just replace the old one with the Infinity one (at least, that's what they did for me).
As someone else said, they need 2 power sockets, one for the modem and one for the hub.
The 2 Engineeers took about 2-hours to do the installation and made a jolly good job of it.
They will phone about an hour before visiting to advise there will be an outage in the phone and existing broadband connection whilst they move the cables etc to the FTTC.
Allergy Advice: This post may contain traces of Meerkats.