List of the major and secondary UK political parties as of January 1st, 2019

Ulster Unionist Party
British unionism, Conservatism, Soft Euroscepticism
 * 1) Ideology
 * 1) Political position Centre-right

Alliance Party of Northern Ireland

 * 1) Ideology Liberalism, Nonsectarianism, Pro-Europeanism
 * 2) Political position Centre

Green Party of England and Wales

 * 1) Membership (2018) Decrease 39,350
 * 2) Ideology Green politics, Eco-socialism, Progressivism, Pro-Europeanism, British republicanism, social justice, environmentalism and nonviolence
 * 3) Political position Left-wing

Scottish Green Party

 * 1) Membership (2017) Decrease 7,091
 * 2) Ideology Green politics, Scottish independence, Scottish republicanism, Pro-Europeanism, social justice, environmentalism and nonviolence.
 * 3) Political position Centre-left to left-wing

Brexit Party

 * 1) Membership (2019) Increase 115,000
 * 2) Ideology Euroscepticism, Populism, British nationalism
 * 3) Political position Right-wing to hard-right

UK Independence Party

 * 1) Membership (2019) Increase 29,000
 * 2) Ideology Hard Euroscepticism, Right-wing populism, Economic liberalism, British nationalism, Anti-islam
 * 3) Political position Right-wing to far-right

Conservative Party (UK)

 * 1) Membership (2019) Increase 160,000
 * 2) Ideology Conservatism, Economic liberalism, British unionism
 * 3) Political position Centre-right to hard-right

Renew Party

 * 1) Ideology Pro-Europeanism
 * 2) Political position Centre

British National Party

 * 1) Membership Decrease 3,000
 * 2) Ideology British Fascism, Right-wing populism, White nationalism, Ethnic nationalism, Ultranationalism, Euroscepticism
 * 3) Political position Far-right

Change UK

 * It formed on 18 February 2019, but is included for completeness.
 * 1) Ideology Centrism, Pro-Europeanism
 * 2) Political position Centre

Socialist Party of Great Britain

 * 1) Ideology Impossibilism, Marxism, Socialism
 * 2) Political position hard left to far left

Plaid Cymru

 * 1) Membership (2018) Increase 10,500
 * 2) Ideology Welsh nationalism, Welsh independence, Civic nationalism, Regionalism, Democratic socialism, Social democracy, Environmentalism, Pro-Europeanism
 * 3) Political position Centre-left to left-wing

Scottish National Party

 * 1) Membership (2018) 125,482
 * 2) Ideology Scottish nationalism‌, Scottish independence, Civic nationalism, Regionalism, Social democracy, Pro-Europeanism‌.
 * 3) Political position Centre-left Big tent

Mebyon Kernow

 * 1) Ideology Cornish nationalism, Civic nationalism, Regionalism, Social democracy, Environmentalism, Pro-Europeanism
 * 2) Political position Centre-left

English Democrats

 * 1) Membership (2015) 2,500
 * 2) Ideology English nationalism, English parliamentary devolution, Euroscepticism
 * 3) Political position Right-wing to far-right

Yorkshire Party

 * 1) Ideology Yorkshire regionalism Social democracy
 * 2) Political position Centre to Centre-left

Liberal Party

 * 1) Ideology Liberalism, Georgism, Euroscepticism
 * 2) Political position Centre

Sinn Féin

 * 1) Ideology Irish republicanism, Left-wing nationalism, Democratic socialism
 * 2) Political position Centre-left to left-wing

.
.

Party stance on democracy
.

Also see

 * 1) List of the major and secondary UK political parties and political stances at selected dates in 2019