Minor parties play a more significant role than they did thirty years ago

The role of minor parties has not been set as an essay since 2021, but the question has been transformed since then by:

• The SNP collapse at the 2024 election
• The Reform UK breakthrough (14.3% of the vote)
• The Green four-seat haul (their largest ever)
• The rise of independent MPs elected over Gaza

Pearson's 2025 examiner report flagged that candidates struggle with the coalition era and with the change-over-time framing. This question sits squarely on those weaknesses.

In 1992, the political system was effectively two-party with a Lib Dem cushion:

• Conservatives 41.9%, Labour 34.4% - between them 76.3% of the vote and 562 of 651 seats
• Liberal Democrats 17.8% but only 20 seats
• SNP 1.9%, 3 seats
• Plaid Cymru 0.5%, 4 seats
• Greens 0.5%, 0 seats
• Reform UK did not exist; UKIP was not founded until 1993

The two-party share of the vote has fallen at almost every election since 2005. The pivotal moments:

• 2010 Coalition - Lib Dems polled 23% and won 57 seats, enough to enter Conservative-led coalition (2010-15). The single most consequential moment in modern minor-party significance: a third party set policy across the constitutional reform agenda (failed AV referendum, fixed-term parliaments, Lords reform), tuition fees and NHS structure.
• 2014 Scottish independence referendum - reshaped Westminster's view of the union
• 2015 SNP earthquake - 56 of 59 Scottish seats
• 2016 Brexit referendum - driven by a UKIP campaign that won zero seats but set the terms of the Conservative leadership election
• 2024 election - Reform UK 14.3%, Greens 6.7% and 4 seats, Lib Dems 72 seats, plus 5 independent MPs elected over Gaza

Seat counts understate minor-party significance. Agenda-setting is the bigger story:

• UKIP 2015 - 12.6% of the vote, 1 seat - and forced the Brexit referendum that reshaped British politics
• Reform UK 2024 - 5 seats, but drove the Conservative right's strategic calculations and pushed mainstream parties on immigration
• Greens - shifted Labour and Lib Dem environment policy
• SNP 2017 - held the balance of power, pushed Brexit's constitutional question into every Cabinet calculation

Minor parties also dominate devolved legislatures - none of this was true in 1992:

• SNP - has governed Scotland for over a decade
• Plaid Cymru - official opposition in Wales
• Sinn Fein - largest party in the Northern Ireland Assembly since 2022
• Greens - hold ministerial office in the Scottish Government

The fair counter is that Westminster remains a two-party legislature at executive level:

• Labour + Conservative held 532 of 650 seats after 2024 - over 80%
• No minor party has formed a government since 1922
• FPTP under-rewards minor parties at general elections regardless of vote share - the 2024 Reform UK result proves it: 14.3% of votes, 5 seats
• Government formation remains a Labour-or-Conservative question; minor parties relegated to coalition or supply-and-confidence only when neither main party can govern alone
• The 2010-15 Coalition is the only such episode in postwar Britain

The line of argument is YES TO A LARGE EXTENT - minor parties play a much more significant role than they did in 1992. The evidence is overwhelming:

• Agenda-setting - Brexit driven by UKIP, immigration shaped by Reform
• Seats won - combined non-Lab-Con seats more than tripled 1992-2024
• Coalition government - the 2010-15 Coalition is unique in modern times
• Devolved government - SNP, Plaid, Sinn Fein all dominant in their nations
• Vote share - two-party share has fallen by nearly 20 points across the period

Interim judgement. Significance has grown most where the rules permit it - devolved chambers under PR, referendums, the agenda of the major parties - and least where FPTP suppresses it - Commons seat counts.