matthewr
spɹɐʍʞɔɐq spɹoɔǝɹ ɹnoʎ sʎɐld
Beyond that I honestly don't think that you can "exclude the new populist right from power" with what will almost certainly be seen as electoral shenanigans without very serious consequences
Yeah, I should probably have said exclude from complete power.
I don't want to suggest that a party that gets a 30 to 40% share of the vote should not have some representation, only that we need to make sure they don't get an overall majority when they have shown themselves to do things like suspend parliament, Brexit, austerity, gerrymandering, deport asylum seekers, etc.
Basically I used to be against PR for broadly the reasons you state (it's to some extent giving in on ever forming a government that can make significant change) but given the way the Tories have learnt from other crypto-fascist experiments I think we need to protect ourselves against them ever forming a majority government again. Everything we see in history is once they cross this line, they will get worse and there is significant danger of a weakening of democracy and a slide into authoritarianism.