First Past the Post: How it Works, Advantages, and Criticisms

This lesson provides a detailed analysis of First Past the Post (FPTP), the electoral system used for UK general elections. Understanding FPTP — its mechanics, effects, and the debate surrounding it — is essential for A-Level Politics.

How FPTP Works

First Past the Post is a plurality electoral system. In each constituency:

Voters cast one vote for a single candidate
The candidate with the most votes wins the seat — they do not need a majority (50%+), only a plurality (more than any other single candidate)
All other votes are effectively "wasted" — they do not contribute to the outcome
The party that wins the most seats nationally (usually) forms the government

Feature	Detail
Type	Plurality (winner-takes-all)
Ballot	Voters choose one candidate
Constituencies	650 single-member constituencies in the UK
Winner	The candidate with the most votes in each constituency
Used for	UK general elections, English and Welsh local elections

Key Features and Effects of FPTP

1. Single-Member Constituencies

Each constituency returns one MP. This creates a direct link between the MP and their local area — constituents know who represents them and can hold them to account.

2. Disproportionality

FPTP produces results where the share of seats does not reflect the share of votes. This is its most criticised feature.

Election	Party	% Vote	% Seats	Seats Won
2019	Conservative	43.6%	56.2%	365
2019	Labour	32.1%	31.1%	202
2019	Lib Dems	11.6%	1.7%	11
2019	SNP	3.9%	7.4%	48
2015	UKIP	12.6%	0.2%	1
2015	Greens	3.8%	0.2%	1

The SNP, with a concentrated vote in Scotland, is rewarded by FPTP, while parties with a spread-out vote (UKIP, Lib Dems, Greens) are severely penalised.

3. Safe Seats and Marginal Seats

Safe seats are constituencies where one party has such a large majority that the result is a foregone conclusion. This reduces voter motivation and means campaigns focus on marginal seats.
Marginal seats are those that could be won by more than one party. These receive disproportionate campaign attention and resources.
It is estimated that elections are often decided by a relatively small number of voters in marginal seats.

4. "Wasted" Votes

Votes for losing candidates and surplus votes for the winner are "wasted" — they do not contribute to the allocation of seats. In 2019, an estimated 22.6 million votes (about 70% of all votes cast) were "wasted" in this sense.

5. Tactical Voting

Voters may not vote for their preferred candidate but instead vote for the candidate most likely to defeat the one they least want. For example, Labour supporters in a Lib Dem-Conservative marginal might vote Lib Dem to keep the Conservative out. This distorts the expression of genuine preferences.

6. Duverger's Law

The political scientist Maurice Duverger argued that FPTP tends to produce a two-party system. This is because smaller parties are squeezed out and voters have an incentive to vote for one of the two main parties to avoid wasting their vote.

Advantages of FPTP

Advantage	Explanation
Simplicity	Easy for voters to understand — one vote, one candidate
Constituency link	Strong connection between MP and local area
Stable government	Tends to produce single-party governments with working majorities, avoiding coalition instability
Accountability	Clear mandate for the governing party; easy for voters to "throw the rascals out"
Speed of results	Quick and straightforward to count
Extremist parties	Makes it very difficult for extremist parties to win seats

Criticisms of FPTP

Criticism	Explanation
Disproportionality	Seats do not reflect votes — some parties are grossly over- or under-represented
Wasted votes	The majority of votes do not contribute to the result
Safe seats	Many constituencies are uncompetitive, reducing voter motivation
Tactical voting	Voters may not express their genuine preferences
Minority governments	Governments can win a majority of seats with well under 50% of the vote (e.g. 2005: Labour won 55.1% of seats with 35.2% of the vote)
Geographic bias	Parties with concentrated support (SNP) are rewarded; those with spread-out support (UKIP, Greens, Lib Dems) are punished
Underrepresentation	Smaller parties, women, and ethnic minorities may be underrepresented

Case Study: The 2024 General Election

The 2024 general election provided a stark illustration of FPTP's effects:

Labour won a large parliamentary majority, with a historically modest vote share
Reform UK won millions of votes but a relatively small number of seats
The Liberal Democrats won dozens of seats on a similar vote share to Reform, demonstrating the importance of geographic concentration
The Conservatives lost heavily despite retaining a significant vote share

This result reignited the debate about whether FPTP produces a fair reflection of public opinion.

Evaluation: Should the UK Keep FPTP?

Arguments for keeping FPTP:

It produces stable, single-party governments
It maintains the constituency link
It is simple and well-understood
It prevents extremist parties from gaining a foothold
Coalition governments (as in PR systems) can be unstable and give disproportionate power to small parties

Arguments for replacing FPTP:

It is grossly disproportionate
It wastes millions of votes and creates safe seats
It forces voters into tactical choices rather than expressing genuine preferences
It produces "elected dictatorships" where a party with minority support has a majority of seats
Most modern democracies use some form of proportional system

Exam Tip: FPTP is one of the most commonly examined topics. Be prepared to use specific election data to illustrate your points, and always present both sides of the argument. Link your analysis to broader themes of representation, legitimacy, and democracy.

Key Terms

Term	Definition
FPTP	First Past the Post — a plurality electoral system
Plurality	Winning by having more votes than any other candidate, not necessarily a majority
Disproportionality	A mismatch between vote share and seat share
Safe seat	A constituency where the outcome is highly predictable
Marginal seat	A constituency that could be won by more than one party
Wasted vote	A vote that does not contribute to electing a candidate
Tactical voting	Voting for a less-preferred candidate to prevent a disliked candidate from winning
Duverger's Law	The theory that FPTP tends to produce a two-party system

Summary

FPTP is a simple plurality system used for UK general elections.
It tends to produce strong, single-party governments with a clear constituency link.
It is widely criticised for disproportionality, wasted votes, safe seats, and penalising smaller parties.
The debate about whether to keep or replace FPTP is central to discussions about UK democracy.