FTTP On Demand doesn't exist
Today I have called every fibre company with a presence in my county. Literally none of them will do FTTP On Demand. It's not a case of cost, they simply won't consider doing it. Most support agents answering phones have never heard of it and none of the companies were able to provide it.
For reference, I'm in a rural area, about 25m from the cabinet, no buildings between me and the cabinet. About 25% of properties in the village have FTTP.