Nobody decides to suddenly list anything. If it's not available, it's not listed as available. When FTTP is rolled out to an area, the properties who have had FTTP infrastructure rolled out to them would be added to the database as having FTTP available.
That's not entirely true, the whole of my road and side roads all have the FTTP infrastructure (Fibre DP's, Manifolds etc) which my actual Fibre daisy chains through.
They even upgraded a few chambers so that they could mount the DP's correctly in them.
Sadly BT have now decided on relocating the copper lines from an old cast iron cabinet to a new aluminium cabinet and also installing a FTTC cabinet and it now seems that the remaining homes down my road and lower side roads (even though all the FTTP infrastructure is in place) are going to get FTTC.
So no its not if the hardware is there, its down to their decision whether you get FTTP or not.
Maybe its all boils down to overall cost and how fast they can get the funding back, due to not everyone will go for the top speeds and most would be happy with Infinity 1 or 2.
TBH I think its a waste of time and money installing a FTTC cabinet where there is already FTTP hardware in place, especially when BT want to end up installing FTTP everywhere.
Paul