Constitutional and Administrative Law

The Backbone of the British Constitution

A constitutional concordance mapping the recurring account of the United Kingdom's constitutional identity, institutions, principles, rights and relationships across Parliament, the Executive and the courts.

Teaching and research edition · October 2026 · companion: the Reading Room

What is a constitutional concordance?

Many nations have framed their constitutions with constituent assemblies or deliberative processes. For various reasons this is absent in the United Kingdom. Instead, we need to trace our constitutional outline through various legal and non-legal sources. The concordance is an attempt to trace what the essential features of the constitution are, and where there is agreement between the branches of government on this.

Each row begins with a constitutional proposition. The remaining columns identify where that proposition is recognised in legislation, official executive or parliamentary description, and judicial authority. The object is not merely to list constitutional materials, but to reveal the constitutional order which those materials collectively describe.

The central claim is modest but important: the British constitution is uncodified, but it is neither unreal nor institutionally undescribed. Across different organs of the state, a persistent account of its architecture can be identified. This concordance is a selective map of recurring constitutional propositions, not an exhaustive inventory of constitutional law.

Links to sources open in a new tab.

The Crown and the branches of government

The Crown The source of the three branches of government. The Crown in Parliament legislates; His Majesty's Government is the executive; the Crown dispenses justice in its courts. The King's enjoys some reserve powers, exercised in accordance with his own judgment. Otherwise his prerogative powers are exercised on advice (and it is the advice which the UKSC reviewed in Miller (No 2)). The Crown in Parliament The legislative branch or legislature: Crown, Lords and Commons together. An Act is the product of all three, save as the Parliament Acts provide. Its enactments are interpreted by the courts; qualifying Withdrawal Agreement rights may require an inconsistent enactment to yield under statute; declarations under the Human Rights Act do not affect validity. His Majesty's Government The executive. Ministers act under statute, prerogative or common law. The prerogative cannot grow and yields to statute. Checked by Parliament through responsible government and by the courts through judicial review. The Crown's courts The judicial branch or judiciary. Declares the law and reviews the legality of public action: a function statute recognises and presupposes. Checked by parliamentary sovereignty, by appeal, and by the limits it sets on its own jurisdiction.

Showing all propositions.

Concordance of constitutional propositions and official authority
Strand Constitutional proposition Legislation / legal text Executive / parliamentary description Judicial authority Status and tension
Constitutional identity § The United Kingdom possesses a constitution. Its component rules appear in the common law, constitutional statutes, legally recognised institutional arrangements, and constitutional practices (conventions). R (Miller) v Prime Minister [2019] UKSC 41, [39]–[40] A R (Miller) v Secretary of State for Exiting the EU [2017] UKSC 5, [136]–[151] A High concordance
The familiar claim that the UK “has no constitution” confuses absence of codification with absence of a constitution.
Constitutional identity § The constitution is uncodified, historically evolved and capable of further development. No single canonical instrument; development occurs through legislation, common law and constitutional practice. Miller (No 2) [2019] UKSC 41, [39] A High concordance
“Uncodified” is more accurate than “unwritten”: much of the constitution is written, but not consolidated in a superior constitutional text.
Institutions and authority § The UK is a parliamentary democracy under a constitutional monarchy, with an Executive drawn from and accountable to Parliament and an independent judiciary. Institutional elements are recognised across electoral law, the Constitutional Reform Act 2005 A and legislation governing Parliament and ministers. Cabinet Manual (2011), para 1 B Miller (No 2) [2019] UKSC 41, [41]–[48] A High concordance
The constitution is an institutional order, not merely a list of source-types.
Crown and branches § The three branches of government have envolved under the Crown and it is the source of their powers: the Crown in Parliament legislates, His Majesty's Government is the executive administering the UK, and the in the Crown's courts His Majesty's judges dispense justice. In law the King is all powerful but all his powers, bar a few reserve ones, are exercised on ministerial advice. The King is a constitutional monarch. Cabinet Manual (2011), para 6; ch 1 (The Sovereign) and ch 2 (Elections and government formation) B — the Sovereign's prerogative powers are exercised by or on the advice of ministers, save the reserve powers. R (Miller) v Prime Minister [2019] UKSC 41 A — the Prime Minister's advice to the Queen was unlawful, so the prorogation was void: the Sovereign was wrongly advised, and it is the advice, not the Sovereign, that the courts control. Moderate concordance
Description and case law agree that the Sovereign acts on advice; they diverge on who polices the advice. The 2022 Act revives the prerogative of dissolution and, in s 3, seeks to place its exercise beyond the courts.
Crown and branches § Parliament is bicameral and tripartite — the Crown, Lords and Commons; an Act is the product of all three save as the Parliament Acts provide; and each House governs its own proceedings. High concordance; legally qualified effects
Courts interpret legislation and may declare it incompatible with Convention rights without affecting its validity. Under s 7A of the European Union (Withdrawal) Act 2018, a directly effective Withdrawal Agreement or Windsor Framework obligation may in principle require an inconsistent enactment to yield, but only where the applicable direct-effect and substantive tests are satisfied. Dillon held that they were not satisfied on the facts. These consequences arise from legislation enacted by Parliament, not from a general judicial power to control the Crown in Parliament. The Jackson obiter on whether sovereignty has limits remains contested.
Crown and branches § His Majesty's Government is the executive. Ministers act under statute, prerogative or common law; the prerogative cannot grow, yields to statute, and its limits are set by the courts.
  • Case of Proclamations (1611) 12 Co Rep 74; Entick v Carrington (1765) 19 St Tr 1029.
  • Attorney General v De Keyser's Royal Hotel Ltd [1920] AC 508; BBC v Johns [1965] Ch 32.
  • Council of Civil Service Unions v Minister for the Civil Service [1985] AC 374; R v Secretary of State for the Home Department, ex p Fire Brigades Union [1995] 2 AC 513.
  • Miller (No 1) [2017] UKSC 5 A; Miller (No 2) [2019] UKSC 41 A
 High concordance
The Cabinet Manual's account of the sources of ministerial power and the Supreme Court's account in the two Miller cases agree. The concordance is the finding.
Crown and branches § The Crown dispenses justice in its courts. The courts' authority to declare the law and to review the legality of public action is a constitutional function that statute recognises and, on the courts' account, presupposes. High, effects contested
Laws LJ at [98]: the limits of the jurisdiction "are (generally) set by itself" — the boundary between a place the jurisdiction cannot go and a place the court will not send it is, in his word, permeable.
Constitutional identity § Certain statutes establish or protect fundamental constitutional arrangements and are recognised as constitutionally distinctive. Their constitutional character can carry consequences for interpretation, repeal and legislative scrutiny.
  • Bill of Rights 1689; Human Rights Act 1998; Scotland Act 1998 A — examples of constitutional statutes identified in Thoburn.
  • European Communities Act 1972 A — the historical example central to Thoburn, HS2 and Miller (No 1); subsequently expressly repealed.
  • These enactments supply constitutional rules. The general doctrine of constitutional statutes is judicially developed; their texts do not provide a single exhaustive classification.
 High, consequences differ
Recognition of constitutional subject matter is broader than agreement on legal hierarchy. The parliamentary reports concern legislative scrutiny and safeguards; the cases address interpretation and legal effect. Protection against ordinary implied repeal does not prevent deliberate amendment or repeal by sufficiently clear legislation. Neither the Manual's inventory nor the 2003 Committee's proposed catalogue is an exhaustive list of statutes with Thoburn status. See the note on institutional disagreement.
Fundamental principles § The Crown in Parliament possesses supreme legislative authority. The principle is largely presupposed rather than exhaustively stated in a single statute. High concordance
Its existence is orthodox; its foundations, limits and relationship with the rule of law remain contested.
Fundamental principles § Representative government connects the exercise of public power to the electorate through a representative Parliament and periodic elections. High concordance
Representative government is not direct popular sovereignty: electoral legitimacy is mediated through Parliament. Referendums are advisory unless legislation gives them legal effect.
Fundamental principles § Responsible government requires the Executive to derive authority through Parliament, retain Commons confidence and account to Parliament for its conduct.
  • At Westminster the principle is not contained in a single enactment. Statutory controls over taxation, supply, expenditure, reporting and scrutiny operate within a structure largely sustained by convention and parliamentary procedure.
  • The devolved constitution supplies a striking statutory analogue. Government of Wales Act 2006, s 46 provides for appointment of the First Minister following Senedd nomination; under s 47(1)–(3), a Senedd resolution that the Welsh Ministers no longer enjoy its confidence is an event requiring the Senedd to nominate a First Minister within 28 days.
 Miller (No 2) [2019] UKSC 41, [46] A treats parliamentary accountability—described through the constitutional principle of responsible government—as no less fundamental than parliamentary sovereignty. High concordance
The fusion of Executive and legislature makes accountability constitutionally essential but practically vulnerable to executive dominance, party discipline and the disabling of parliamentary scrutiny.
Fundamental principles § The rule of law is a pre-existing constitutional principle governing the exercise of public power. Government is conducted under the law. Constitutional Reform Act 2005, s 1 A expressly preserves “the existing constitutional principle of the rule of law”. Constitution Committee (2001): rule of law encompassing individual rights B High concordance
Content is multifaceted: legality, access to courts, equality before law and control of arbitrary power.
Fundamental principles § Judicial independence is both an institutional guarantee and a constitutional principle. Constitutional Reform Act 2005, s 3 A imposes duties to uphold continued judicial independence. Cabinet Manual (2011), para 16 B Reflected throughout the modern case law on the rule of law and separation of powers, including UNISON A. High concordance
Strong statutory reinforcement does not exhaust its constitutional content.
Relationships and accountability § The United Kingdom has a qualified rather than absolute separation of powers. Parliament, Government and the courts overlap institutionally, but remain distinct constitutional organs which must respect one another's core functions; the judiciary is separately independent. High but qualified
Executive–legislative fusion is constitutional practice; judicial independence and mutual respect for core institutional functions are legal principles. Separation restrains interference but does not require isolation.
Relationships and accountability § The Executive–Parliament relationship operationalises responsible government through scrutiny, supply and ministerial accountability. Expressed through statutory reporting, supply and scrutiny arrangements, but resting substantially upon convention and parliamentary procedure. Cabinet Manual (2011), chs 2–5 B Miller (No 2) [2019] UKSC 41, [46] A: parliamentary accountability is no less fundamental than parliamentary sovereignty. High concordance
Sovereignty is functional only if Parliament remains capable of performing its scrutiny and legislative functions.
Relationships and accountability § Government holds office by commanding the confidence of the House of Commons, within a system of representative democracy and periodic elections. Election and dissolution rules provide the legal setting; the confidence principle remains predominantly conventional. Cabinet Manual (2011), chs 2–3 B Miller (No 2) [2019] UKSC 41, [45]–[47] A High concordance
Illustrates the connection between executive authority, parliamentary support and electoral legitimacy.
Rights, freedoms and equality § Fundamental rights and freedoms form part of the constitutional relationship between public power and the individual. Constitution Committee (2001) B defines the rule of law as encompassing the rights of the individual. High concordance
Rights are part of the architecture, not an external qualification bolted onto an otherwise institutional constitution.
Rights, freedoms and equality § The common law recognises constitutional rights independently of the Human Rights Act. Human Rights Act 1998, s 11 A preserves other domestic rights and freedoms. Official constitutional descriptions generally place judicial decisions and the rule of law among the constitution's sources and principles. High concordance
The scope and remedial force of particular common-law rights remain context-sensitive.
Rights, freedoms and equality § The ECHR and Human Rights Act create a distinctive domestic structure for securing Convention rights. Human Rights Act 1998 A: interpretation (s 3), declarations (s 4), public-authority unlawfulness (s 6), proceedings and remedies (ss 7–8). The HRA case law gives effect to Convention rights while maintaining the statutory distribution of functions between courts, Parliament and public authorities. High concordance
The HRA overlays rather than abolishes common-law rights. Parliamentary sovereignty is preserved through the s 4 model.
Rights, freedoms and equality § Convention rights also operate as limits upon devolved legislative and executive competence. Official accounts of devolution treat rights compliance as part of the distribution and limitation of devolved authority. High concordance
Unlike the ordinary HRA model for Westminster Acts, incompatible devolved legislation may be outside competence.
Rights, freedoms and equality § In Northern Ireland, rights are interlocked with the peace settlement, devolution and the UK's international obligations. UK Government, Windsor Framework materials B In re Dillon [2026] UKSC 15 A Strong but specialised
Article 2 is not freestanding incorporation of every EU or Charter right; the protected right, pre-Brexit EU underpinning and diminution must be established.
Institutions and authority § Devolution is a fundamental part of the constitution, and the UK is better understood as a union of nations than as a simply unitary state. Constitution Committee, Respect and Co-operation: Building a Stronger Union (2022) B Moderate concordance
Parliamentary sovereignty remains legally orthodox, while political and constitutional constraints profoundly affect its legitimate exercise.
Relationships and accountability § Constitutional conventions regulate the constitutionally proper use of legally available power. Some conventions receive statutory recognition—most prominently Sewel—without necessarily becoming judicially enforceable rules. Miller (No 1) [2017] UKSC 5, [136]–[151] A High concordance
A legally valid act may nevertheless be constitutionally improper. Sanction is ordinarily political rather than judicial.
Constitutional identity § The constitution has an external dimension formed by international obligations and, where Parliament provides, their domestic legal effect. Examples include the HRA 1998 and EU (Withdrawal Agreement) Act 2020; dualism otherwise governs treaty incorporation. Cabinet Manual (2011), paras 5 and 17–18 B include European and international law in the account of constitutional sources. Miller (No 1) [2017] UKSC 5 A restates the domestic constitutional rules governing treaties and prerogative power. Moderate concordance
International obligation and domestic enforceability must be kept analytically distinct.

What the concordance reveals

The sources converge on a constitution made up not only of legal materials but of institutions, principles and structured relationships of authority and accountability.

Materials

Statute, common law, prerogative, convention, constitutional practice and authoritative exposition supply the constitution's materials.

Architecture

Crown, Parliament, Executive, courts, devolved institutions and electorate form its institutional structure.

Relationships

Representative and responsible government, sovereignty, legality, confidence, accountability, rights and judicial independence govern how constitutional authority is exercised.

Core official sources

These sources provide the principal documentary route into the concordance.

Executive and parliamentary descriptions
Key constitutional statutes
Leading judgments
Northern Ireland rights settlement

Printed from the LAW1035 constitutional concordance, October 2026.