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Between Virgin Media rolling out DOCSIS 3.1 on it's network, BT/Openreach's Full Fibre buildout now at just over 4m homes and the various full fibre 'altnets' that have popped up over the last few years, just over 39% of UK homes now have access to Gigabit capable services
G.Fast and FTTP are two entirely different technologies.
G.Fast is a hybrid fibre/copper technology that's really just an extension/evolution of VDSL/FTTC and therefore only offers maximum speeds of 330/50Mbps, and at very short distances from the cabinet, with the speed dropping off fairly sharply over distance
FTTP being full fibre is capable of Gigabit and beyond