I suspect it was (2) but at believe it was at least considered. I asked the site manager from the construction company who said:
"We do usually get free supply of fibre and install it now in new buildings but it depends on Openreach... they didn’t have the fibre network ready."
The construction probably started in 2016/17 based on planning applications and street view and was handed over in early 2019. No idea when Openreach would have got involved. Frustratingly there is a development exactly opposite on the other side of the main road that was completed less than a year later and has Openreach FTTP and Hyperoptic.
I'm sure if the developer had got Hyperoptic or Community Fibre involved they'd have been much more keen than Openreach to get fibre to the site.
Anyway, was just wondering how Openreach approach these sort of copper-only developments after the fact and how they go about retrofitting when doing the rest of the area.