From what I can figure out about all this is that installing FTTP is cheaper than installing FOD, in the sense if someone asks for FOD then unless that person is close to the current fibre network, it would cost more to build out one property instead of FTTP which they will build a whole area.
I still think FoD is helpful to gauging FTTP demand.
FTTP seems to now be the most cost effective step. Now its just a matter of OR and others, installing more fibre.
Demon => Freeserve => Pipex => Be => Sky => BT Infinity 2