Here's what the 2019 General Election result would have looked like under the purest form of PR, i.e. by distributing MPs only according to the number of votes won by each party...
(Assumption: fractions > 0.5 MP round up.)
Underlying data comes from en.wikipedia.org/wiki/2019_Unit…
(Assumption: fractions > 0.5 MP round up.)
Underlying data comes from en.wikipedia.org/wiki/2019_Unit…
Of course, there are some necessary simplifications. For example I used the vote share across the whole of the UK, but a PR system might want to allocate MPs separately for each of the 4 nations.
But it gives you some idea of what it might look like.
But it gives you some idea of what it might look like.
In theory, one could literally let the maths dictate the total number of MPs in the House of Commons. If you set the cutoff point that a fractional MP gets rounded up to 1 if the fraction's > 0.5, you might end up with around 645-655 MPs elected. It would fall in a narrow range.
For each GE, you would then reset the number of MPs to the nominal 650 for the purposes of calculating how many MPs each party won - but the actual number of MPs elected would depend on how the rounding fell that election cycle.
Added: I went back and sanity-checked the result using the data for each of the 4 nations, and applying PR separately to the number of MPs allocated to each.
It's not exactly the same, but it matches pretty closely my quick-and-dirty estimate using % of the total UK vote...
It's not exactly the same, but it matches pretty closely my quick-and-dirty estimate using % of the total UK vote...
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