The Nature and Sources of the UK Constitution
A constitution is the body of rules, written and unwritten, that establishes how a state is governed, distributes power between its institutions, and defines the relationship between the state and the individual.
Before you start
No specific prerequisites - this is a good place to start.
Method
- Learn the four source categories (statute, common law, convention, authority) and one clear, named example of each, so you can identify which source a given constitutional rule comes from.
- Learn the meaning of 'uncodified' precisely: not that the UK constitution is unwritten (most of it is written down, just not in one document) but that it has no single document with higher legal status than ordinary law.
- Learn the meaning of 'flexible' (changeable by ordinary Act of Parliament, no entrenchment) and be ready to contrast it with the codified, entrenched US constitution, which needs a supermajority to amend.
- For a question on codification, plan three genuinely two-sided paragraphs, e.g. clarity versus flexibility, entrenched rights versus judicial power, and ease of understanding versus a system that has evolved without a revolution or civil war forcing a rewrite.
- Give each paragraph a clear judgement before moving on; a paragraph that only lists arguments for codification, with no counter-argument, is capped in the middle mark band even if accurate.
- Write an introduction with a clear thesis that directly answers the question, and a conclusion that follows from the three judgements already reached rather than introducing new material.
- Use named, accurate examples throughout: the Human Rights Act 1998, the royal prerogative, the Salisbury Convention, and Dicey's rule-of-law principle that no one is above the law.
Worked example
'The flexibility of the UK's uncodified constitution is now more of a weakness than a strength.' Evaluate this statement. Plan the essay before answering: identify a thesis, three two-sided paragraphs and a conclusion.
- Underline the exact claim: is flexibility now more of a weakness than a strength, not simply 'is the UK constitution good or bad'.
- Choose three areas of debate that let flexibility be argued both ways: (1) executive power, (2) protection of rights, (3) adaptability without crisis.
- Paragraph 1 (executive power): flexibility is a weakness because a government with a Commons majority can change constitutional rules, e.g. repealing the Fixed-term Parliaments Act 2011 via the Dissolution and Calling of Parliament Act 2022, without a referendum or supermajority, weighed against the counterpoint that this same flexibility let the UK respond quickly without a lengthy amendment process, then a judgement.
- Paragraph 2 (rights protection): flexibility is a weakness because the Human Rights Act 1998 could in principle be amended or repealed by a simple Act of Parliament, weighed against the counterpoint that Parliament has left the HRA in place for over two decades and flexibility lets rights protection evolve, then a judgement.
- Paragraph 3 (adaptability): flexibility is a strength because major reforms, such as devolution in 1998 or Lords reform in 1999, were made without a codified constitution's amendment hurdles, weighed against the counterpoint that this same ease makes the constitution harder for citizens to know and hold government to, then a judgement.
- Write the thesis in the introduction and a conclusion that weighs the three judgements to give a supported overall answer, rather than simply restating both sides.
Practice questions
Try each question, then tap to reveal the answer.
Q1Name the four main sources of the UK constitution.Show answer
Answer: Statute law, common law, constitutional conventions and works of authority (with historic EU law/retained EU law as a further, post-2018 category).
Q2Give one example of a constitutional convention and explain why it is not legally enforceable.Show answer
Answer: The Salisbury Convention, under which the House of Lords does not block at second or third reading a bill implementing a manifesto commitment - it is a political custom, not a law, so a court cannot strike it down for being broken, though breaking it carries a political cost.
Q3What does it mean to say the UK constitution is 'uncodified'?Show answer
Answer: That its rules are not gathered into one single document with a status higher than ordinary law, even though most of the rules are written down individually in Acts, case law and other sources.
Q4Name one work of authority used to interpret the UK constitution.Show answer
Answer: A.V. Dicey's An Introduction to the Study of the Law of the Constitution, or Erskine May's Parliamentary Practice.
Q5What does it mean to say the UK constitution is 'flexible'?Show answer
Answer: That it can be changed by an ordinary Act of Parliament passed by a simple majority, without any special procedure, supermajority or referendum being legally required.
Q6Give one source of UK constitutional law that changed status as a direct result of Brexit.Show answer
Answer: European Union law: most of it was converted into domestic 'retained EU law' by the European Union (Withdrawal) Act 2018 rather than continuing to apply directly as EU law.
Q7State one difference between the UK and US constitutions in terms of codification.Show answer
Answer: The US constitution is codified in a single document with higher legal status that requires a supermajority to amend, while the UK constitution is spread across several sources and can be changed by an ordinary Act of Parliament.
Exam-style questions
Written in the style of a A Level Politics exam paper, with a full mark scheme.
Analyse TWO sources of the UK constitution, other than statute law.
Show mark scheme
Tick each line you got. Your score builds from the marks on the scheme.
Nothing ticked yet - 10 available
'The case for codifying the UK constitution is now stronger than the case for keeping it uncodified.' Evaluate this statement.
Show mark scheme
Tick each line you got. Your score builds from the marks on the scheme.
Nothing ticked yet - 30 available
See real A Level Politics past-paper questions, with official mark schemes →
Free printable worksheet
Want more practice on paper? Download the the nature and sources of the uk constitution worksheet pack - 6 pages of exam-style questions with a full mark scheme. One email opens every download in this browser for 14 days - no account, no card. Print it for personal and classroom use.
Next topics
Not quite what you needed?
Tell us what is missing on the nature and sources of the uk constitution, or which topic to write up next. Every request is read, and we reply to every one.
Build a full practice pack.
This topic is one of hundreds in the library - pick the ones a student needs and generate a printable PDF in minutes.