After two decades of PR being used for elections to devolved bodies, it is clear that FPTP for UK general elections produces wildly unrepresentative results

How do Westminster election results compare to those of devolved institutions? Ian Simpson looks at how the 2021 election results for the Scottish Parliament, Senedd Cymru, and the London Assembly compare with the results of the previous five sets of Westminster elections. He shows how the Additional Member System, a version of proportional representation that is used across the three devolved institutions, produces much fairer outcomes for voters than the First Past the Post system that is still used for UK general elections.