Vote/Seats Ratio

The UK’s two-and-a-half party system combined with first-past-the-post voting means that the share of the votes parties receive in parliamentary elections can diverge substantially from their share of the seats. Renard Sexton at 538 sums up the recent history of how this works:


The tendency is for the party that gets the biggest “boost” from the system to also be the party that actually won the most votes, which I suppose mutes legitimacy concerns.