The use of
first-past-the-post voting in the United Kingdom means that in the post-War era, only two parties have had a majority in parliament: the
Conservative Party and the
Labour Party. However, strong regionalist movements and the potential for parties to take votes in the centre or extreme fringes of the political spectrum mean that minor parties still play a significant and increasing role in British politics. The
Liberal Democrats, and their predecessors the
SDP–Liberal Alliance and the
Liberal Party (the main opposition to the Conservative Party before the rise of Labour, forming governments six times between 1859 and 1918) have achieved significant numbers of seats and have occasionally been kingmakers (such as during the
Lib–Lab pacts and the
2010–2015 coalition with the Conservatives) and are sometimes also classed as a major party. The nationalist
Scottish National Party and
Plaid Cymru hold a significant number of seats in their Home Nations, with the SNP controlling 56 of 59 Scottish Westminster seats at the
2015 general election, and every single Northern Irish seat is held by a regional party – either the
republican Sinn Féin and
Social Democratic and Labour Party, or the
unionist Ulster Unionist Party and
Democratic Unionist Party. In the
2015 general election,
UKIP won 12.6% of the popular vote, though only one seat. UKIP fared better in European elections, and from 2014 to 2019, was the largest British party in the European Parliament. UKIP was de facto succeeded by the Brexit Party, which also had great success in European Parliament before
Brexit went into effect. The Brexit Party subsequently renamed itself
Reform UK, which went on to win 14.3% of the vote and 5 seats in the
2024 general election. Other parties that have held seats in devolved assemblies, the House of Commons or the European Parliament in the 21st century include the non-sectarian Northern Irish
Alliance Party, the
far right British National Party, the healthcare-focused
Independent Community & Health Concern, the cross-community Northern Irish
NI21, the cross-community feminist
Northern Ireland Women's Coalition, the anti-austerity
People Before Profit Alliance, the left-wing Northern Irish unionist
Progressive Unionist Party, the left wing
Respect Party, the left wing nationalist
Scottish Socialist Party, the elderly interest
Scottish Senior Citizens Unity Party and the unionist Northern Irish
Traditional Unionist Voice and
UK Unionist Party. Whether or not a party counts as a major party is a sometimes heated argument, since "major parties" as defined by
Ofcom are entitled to more
party political broadcasts than minor ones. ==United States==