G.fast covers over a million premises in the UK. Extremely low take up partially as they started acceleration of FTTP build pretty much at the same time.
By the way most of the fibre needed to connect the FTTC/VDSL/GFast cabinets was already in the ground and they just needed to splice into it, as it was there for exchange to exchange backhaul, and leased lines. It's the final ~500 metres that's the expensive part of installing FTTP, as that has to be new and there is probably not a lead in duct that is clear so means climbing poles, clearing duct, or new trenching.
By the way most of the fibre needed to connect the FTTC/VDSL/GFast cabinets was already in the ground and they just needed to splice into it, as it was there for exchange to exchange backhaul, and leased lines. It's the final ~500 metres that's the expensive part of installing FTTP, as that has to be new and there is probably not a lead in duct that is clear so means climbing poles, clearing duct, or new trenching.