Does the United Kingdom Have a Constitution?

An Uncodified, Evolving Constitution

The UK does not have a single written document called "the Constitution." Instead, it has an uncodified constitution—a complex tapestry of statutes, common law, conventions, and authoritative works that together constitute the rules of government.

Key Written Sources (Statutes)

• Magna Carta (1215) – due process, limits on monarch
• Bill of Rights (1689) – parliamentary supremacy, free elections, no cruel punishment
• Act of Union (1707) – England + Scotland = Great Britain
• Parliament Acts (1911, 1949) – Commons dominance over Lords
• European Communities Act (1972) – EU law supremacy (repealed 2020)
• Human Rights Act (1998) – incorporates ECHR
• Devolution Acts (1998) – Scotland, Wales, NI legislatures
• Fixed-term Parliaments Act (2011, repealed 2022)

Unwritten Conventions (Non-Legal but Binding Politically)

• Monarch reigns but does not rule; acts on ministerial advice
• Prime Minister must command Commons confidence
• Cabinet collective responsibility
• Ministerial individual responsibility
• Parliamentary sovereignty (though debated post-Brexit/HRA)

Judicial Decisions

Court rulings (e.g., Entick v Carrington, Miller I & II) define constitutional limits.

Why It Matters

Flexibility: constitution evolves with politics. Risk: no entrenched rights; Parliament can change "constitutional" laws by simple majority. Ongoing debate: should the UK codify?