I did research for having fibre installed at our offices in central London, Hyperoptic offered installation of 100/100 Mbit for £1000 and £450/month.
We ended up going with a 50Mbit (don't know upload yet) through some MPLS thing (main ISP is in another country and subcontracted to Talk Talk Business) and we had BT Openreach send contractors who mucked up the fibre, then real BT Openreach engineers who had to fix the fibre running into the building then do work on the street because the contractors cut the cables on a node or something
Anyhow, I'm wondering if what they're installing now is in fact, FTT{ on Demand, it is probably costing just as much as the Hyperoptic...