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Electoral Systems in the UK

First Past the Post: how it works

  • 3 things to know
  • AS Unit 2

Overview

How First Past the Post works, winner's bonus under First Past the Post and duverger's law.

What you need to know

Answer each one before you reveal it.

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Key term

Describe how First Past the Post works.

Numbers

How many single-member constituencies elect the House of Commons?

Numbers

Which elections apart from Westminster contests use First Past the Post?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Describe how First Past the Post works.

    Model answer

    The country is divided into single-member constituencies and the candidate with the most votes in each one is elected, whatever share of the vote that is.

  2. 2

    How many single-member constituencies elect the House of Commons?

    Model answer

    The House of Commons is elected from 650 single-member constituencies.

  3. 3

    Which elections apart from Westminster contests use First Past the Post?

    Model answer

    Local council elections in England and Wales use it; mayors and Police and Crime Commissioners were also elected by it after the Elections Act 2022, until the English Devolution and Community Empowerment Act 2026 restored the supplementary vote.

  4. 4

    Explain why a candidate can win a First Past the Post seat with well under half the votes.

    Model answer

    Only a plurality is required, so where three or more candidates split the vote the winner may be well short of a majority.

  5. 5

    What is meant by the winner's bonus under First Past the Post?

    Model answer

    The winner's bonus is the way the leading party's share of seats normally exceeds its share of votes, exaggerating its victory.

  6. 6

    State Duverger's law.

    Model answer

    Duverger's law holds that a single-member plurality system tends to produce a two-party system, because voters desert parties that cannot win locally.

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