I don't fully understand what you mean by this? The master socket in the loft will have nothing at all plugged into the front of it. You just run cable from a drum with no connectors on the end.
I think we are saying thesame thing excuse my terminology, so the master socket will just act as a junction box that is easier for a novice like me to wire/understand, so what I will have is a twisted pair directly for broadband coming off the box and then 2 x junctioned connections for 2 seperate phone line extensions, is this correct ?