When voters go to the polls on 4 July, the candidate who gets the most votes in each constituency becomes its MP...Critics argue this means millions of votes are not reflected in the make-up of the House of Commons.
In turn, the party with the most MPs wins the election. If that party has more MPs than all the other parties put together - called a Commons majority - it forms the government...The party leader automatically becomes prime minister.
The two largest parties - the Conservatives and Labour - both back first-past-the-post. They argue the system is simple and well-understood by voters, and that it maintains a clear link between constituents and their MP.
Because one party tends to form a majority under this system, supporters also say it gives the winner the chance to put its...
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