> One of the issues with our proportional electoral system is that smaller, more extreme parties can become kingmakers and in our current situation the centre-left governing party relies on the support of the far-left party to stay in power, and those guys are rabidly anti-nuclear power.

A side comment but I'm sad to say I don't think that another electoral system (or at least not FPTP) fixes this issue of there being a niche group being kingmakers.

In FPTP the dynamic that occurs is that an enormous amount of seats become "safe" and then the kingmakers end up being the relative handful of seats that are likely to trade hands. This ends up creating distortions where certain regional seats and regional issues rise well above how important they should be.

PR seems like a more fair way to represent a niche group. At least they are a genuinely representative part of the population, and the influence isn't an accident of electoral math distortion.