It's the difference between proportional voting vs winner takes it all. In the latter case you can't really hold politicians accountable, as you will have to choose between effectively throwing your vote away or voting for the one opposition candidate, that often will be just as bad.
While the UK have some level of representativeness, each circuit has a winner takes it all structure, making change quite hard to achieve on a larger scale.
While the UK have some level of representativeness, each circuit has a winner takes it all structure, making change quite hard to achieve on a larger scale.