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Electoral Reform

Additional Member System

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The Additional Member System (AMS) is a voting system in which there are constituency seats which are usually allocated on the First Past the Post basis and additional seats awarded using party lists in order to achieve a degree of proportionality. Sometimes there are conditions parties must fulfil win list seats.

For example in London a party must either have:

  • 5% or more of the total vote
  • 1 or more constituency seats

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