I don’t think BT would add any of their services to that box for you. You’d need to take out a new 24 month subscription and BT would loan you a new box for that. You don’t say how the family member came about the BT pro tv box, although I’m aware of their availability from one or two sources.
they took out a new subscription but still using a old box which they want to keep because of their recordings.
Do they still send the new box back then or only send it back if they cancel BTTV?