If you look on the maps on this site you can actually see whatFTTP
has been rolled out.
You can also click on the Constituency Full Fibre/FTTP Coverage Levels to see stats for each area.
The news articles also show how the picture is changing and how fast. The OR one is at https://www.thinkbroadband.com/news/8639-january-202...
but there are others for the other large FTTP operators.
Regardless of the technology 95% of the population are happy with sub 80Mb speeds and only pay for the slowest package that gives them a delay invisible service.
MTBF ( Mean time between failures) on the copper distribution carrying broadband is actually very low somewhere around 8 years. but as always those with failures are the ones you hear about not the 95% that have no problems
A significant number of the complaints you hear ( Outside those caused by distance) are actually ISP or customer premises issues where ISP staff blame OR as that shifts the blame.
Some of the slow speed complaints are by people that don't want to upgrade to a faster service due to an increase in cost or just don't know that they can get a faster speed. See "the slowest streets in Britain" where most streets can get speed 10x+ faster if they were prepared to change product.