The Mayor of London and other UK mayors are elected through a system known as the supplementary vote. Voters choose their first and second preferences and a candidate can only be elected in the first round if they get 50% of the vote. If no-one achieves this, all but the top two candidates are eliminated and their second preferences redistributed to the candidates still in the race. The candidate with the most votes is then elected. This is only suitable for electing a single office holder or MP.


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