My small private housing development, approx 50 dwellings all UG POTS fed, all DIG as property ages range from 60 to 40 years old, was completely fibred by OR sub-contractors Feb/March 21, I was pleasently surprised at the time, thought we would be well down the pecking order in favour of more densley populated arial fed areas where the potential uptake for OR would be much higher.
Our area also has long standing cable availability back to the NTL days.
So as BS has said, certainly in this case, OR were willing to accept the challenge of more difficult/costly UG non-ducted fibre runs footway CBT's to property for potentially quite low uptake.
Ironically, low uptake seems to be the case to date, probably due to the long established cable availability and the age of most of the residents, quite a few of my neighbours have chosen to remain on ADSL2+, never even changed to FTTC all be it with quite long copper runs to the DSLAM.