No political party provides a ten thousand page breakdown of exactly what it is they are promising, but I guess the idea that your service will be degraded to a Communist inspired level playing field of 100Mb is laughable.
In all practicality, those enjoying faster speeds will continue to enjoy them, while everyone else will get boosted to 100Mb.
Whether your faster service comes at a premium or not is arguable, but I guess what you're paying now will have at least £30 knocked off.
Insisting a community gets a bus service does not then mean they have to sell their cars. It means they get some choice where none existed, while those who could never afford a car get the opportunity to look beyond village life.