Explain and analyse three electoral systems used in the UK
p - one member for each constituency, candidate with most votes wins, often results in a two party system
e - 2019 general election, Conservatives only got 43.6% but got 317 seats
e - can have good relationship with constituency however it usually favours the two strongest parties which can result in wasted votes
p - used for mayor of London, voter records their first ad second preferences, if none win majority, second preferences votes for two remaining added to first preference
e - Sadiq Khan won 40% of the first vote and 55.2% of the second vote against Conservative Shaun Bailey
e - winning candidate may be elected without winning a majority of votes if second preference voted aren't used effectively
3) Single Transferable Vote
p - each voter casts a single vote in the form of a ranked-choice ballot. Voters have the option to rank candidates, and their vote may be transferred according to alternate preferences if their preferred candidate is eliminated or elected with surplus votes
e - In Northern Irish elections, 239 candidates contested the 90 available seats in the Assembly in 18 constituencies
e - multi member constituencies weaken link between individual MP's and their constituency, donkey voting
4) Additional member system
p - voters are given a ballot paper which asks them to record two votes. The first vote is for an area or constituency MSP, the person with the most votes wins, also given the opportunity to vote for a political party. Once all the first votes are counted and constituency MSPs elected, this second vote is used to make the overall representation of each of the political parties fair
e - In Scotland, voters elect 73 MSPs from the Westminster-style first ballot paper and 56 from the second ballot paper.
e - smaller parties are underrepresented because in multimember constituency only few representatives