Don't know if this helps but thought I would describe how my system is set up.
Communual Tv, radio and antenna dish (with quad lnb)
The TV and radio feeds are fed into a combiner that has 13 outputs. 12 go to the bedrooms of the 12 flats the 13 goes in to a digital mux as well as the four LNB feeds (high, low, vert, horiz). This digital mux has 12 outputs which feed the 12 flats front rooms.
So with out any changes each flat has one fully functional socket in the lounge (TV, FM, Sat) and one TV/FM only socket in the bedroom.
What I have done is made a slight change. I have made an agreement with a neighbour who does not want Sky at all. By using two cross over wires I am know feeding their lounge with my bedroom feed from the combiner, and their lounge feed from the mux now feeds by bedroom socket. All I did then was pull my bedroom feed up into the roof put an extension on it, run it down the side of the flat and came in through the wall to give me 2 TV,FM SAT feeds in the lounge. Thus allowing the 2 sky feeds for Sky +.
If any one wants I can attach a wiring diag for the whole system, I think