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United Kingdom

United Kingdom of Great Britain and Northern Ireland

Common lawUnitary parliamentary constitutional monarchyReviewed· 2026-06-20
Capital
London
Population
68,500,000
Languages
English, Welsh
Currency
GBP

United Kingdom · Constitution

Uncodified constitution

Assembled from statutes (Magna Carta 1215, Bill of Rights 1689, Acts of Union, Human Rights Act 1998, Constitutional Reform Act 2005), common-law principle, and binding constitutional convention. Any Act of Parliament can alter it by ordinary majority.

The constitutional text

Assembled from statutes (Magna Carta 1215, Bill of Rights 1689, Acts of Union, Human Rights Act 1998, Constitutional Reform Act 2005), common-law principle, and binding constitutional convention. Any Act of Parliament can alter it by ordinary majority.

Separation of powers

The executive sits inside the legislature. Judicial independence was strengthened in 2005 when the Supreme Court replaced the Appellate Committee of the House of Lords.

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