Average adult population of constituencies is 75,000.
Only a plurality needed to win the seat, not a majority.
In 2017, the SNP won Lanark and East Hamilton with only 32.6% of the vote.
In 2015 General Election, only 319 MPs won an absolute majority.
In 2015, 50 MPs secured their seat with less than 40% of the vote.
Importance of concentrated support
FPTP favours parties with support concentrated in certain areas.
In 2017; Labour won 40% of the vote and 40.3% of seats especially in Northern England and Wales.
Parties with dispersed support such as Greens and UKIP, win few individual seats; in 2017, Greens won 1.6% of the vote but this translated into just 1 seat.
FPTP benefits the SNP in Scotland because their opponents Labour and the Conservatives have dispersed support.
Votes per successful candidate
Impact of FPTP can be judged by how many votes it took for each party to secure the election of a candidate.
This is calculated by dividing total number of votes won by each party nationally by the number of seats won.
In 2017; Greens need over 525,000 votes to elect one MP whereas DUP needed just 29,000.
Northern Ireland parties benefit due to being evenly matched and having low voter turnout.
Summary of FPTP
Gives advantage to parties with concentrated support in certain regions.
Favours larger parties.
There is a 'winner's bonus'; in 2017, Conservatives won 42.4% of the vote but converted this into 48.9% of seats.
Tends to produce an outright winner - however in 2010, 2015, and 2017 it produced weak majority or minority governments.
Associated with majority governments.
Disadvantageous to parties with dispersed support.
Safe Seats
Electoral Reform Society estimates that in 2015, 368 seats out of 650 were safe seats.
Estimated that 25.7 million voters live in safe seats.
Negatives: Parties pay little attention to safe seats, so voters less informed; MPs for safe seats are less accountable because less likely they will be defeated; voters in safe seats may feel their votes are 'wasted'; votes in safe seats are not of equal value to marginal seats.
Electoral Reform Society suggested that in 2015 over 22 million votes were wasted.
Marginal seats
In 2015, estimated that there were 194 marginal seats.
Voters in marginal seats feel that their votes matter.
Parties concentrate efforts on marginal seats.
Character and policies of MPs in marginal seats becomes important.
May result in 'tactical voting'.
Arguments against FPTP
Not a proportional system.
Produces 'electoral deserts' where votes are essentially wasted.
Encourages tactical voting which can cause voters to abandon their true political beliefs.
Prevents new parties breaking into the system; reduces plurality of views.
Since 1945, the winning party in government has never won more than half the popular vote - in 2015, the Conservatives were elected with just 36.9% of the popular vote.
Arguments in favour of FPTP
Clear constituency-MP bond; increases accountability of MPs.
Produces a clear electoral winner; promotes strong and stable government.
2011 Alternative Vote referendum saw a resounding no to electoral change.
Prevents extremist parties gaining political power.
Allows for MPs to be elected based on complex individual policies and character rather than the views of the national party.