Have FTTP since Dec 2020.
150mb into home - wifi not achieving more than 40mb. Pretty hopeless for a small bungalow.
Couldn't get any answer from BT - no surprises there.
Been using powerline to get good speeds. Irritated by not being able to use wi fi.
Had one last go at it today. I switched off the 2.4ghz channel. Hey presto - full speeds - immediately.
Bizarre, but it works.