Really G.halffast. A network where many will get 100-300 megabits is a major improvement, although it's not the 500+ megabits CEO Gavin Patterson envisioned with G.fast. Higher speeds would require running fiber to the millions of distribution points; the money men decided to install fewer than 10% as many boxes, going to some of the 90,000 field cabinets instead.
Going to the cabinets is likely to bring ~300 megabits to less than half and slower speeds to everyone else. The "typical" home is 350 meters, which if lucky can carry 300 meg. Some unknown percentage will get 3 megabits or less.