Plain-language explanation.
Constitutional law defines the fundamental rules of a political system — how government is organised, how power is limited, and how individual rights are protected. It is both a legal discipline and a political science.
Core concepts and standard treatment.
Core constitutional law covers constitutional forms (written vs unwritten — UK uncodified — constitutional statutes, conventions, prerogative, common law, works of authority; codified constitutions — US 1787 — supermajority amendment; German Basic Law — GG 1949 — eternity clause Art. 79(3); EU treaties — Van Gend en Loos direct effect — Costa v ENEL supremacy), separation of powers (Montesquieu — legislative, executive, judicial; bicameralism — Lords and Commons; presidential vs parliamentary — US separation vs UK fusion; judicial independence — JAC — UK; Marbury v Madison 1803 — judicial review established), fundamental rights (ECHR 1950 — Council of Europe; HRA 1998 — s.3 interpretive duty, s.4 declaration of incompatibility, s.6 public authority duty; EU Charter; US Bill of Rights — First Amendment — 14th Amendment equal protection; proportionality — structured proportionality), and judicial review (ultra vires — illegality, irrationality — Wednesbury; procedural impropriety — GCHQ case; proportionality — enhanced judicial review; legitimate expectation — Coughlan).
Deeper theory, debates and edge cases.
Advanced constitutional law covers constitutional design and democratic backsliding (Levitsky and Ziblatt How Democracies Die — legal erosion; Hungary Fidesz constitutional capture; Poland PiS judicial independence; V-Dem liberal democracy index; Venice Commission; Ginsburg and Huq How to Save a Constitutional Democracy), devolution and federalism (Scotland Act 1998/2016 — Smith Commission — reserved vs devolved; Wales Acts 2017/2019; NI Belfast Agreement 1998 — GFA — power-sharing; UK Internal Market Act 2020 — protocol; German federalism — Basic Law — Bundesrat — Laender fiscal equalisation), and parliamentary procedure (Salisbury Convention; Fixed-Term Parliaments Act 2011 — Dissolution and Calling of Parliament Act 2022; prorogation — Miller II 2019 Supreme Court; money bills — financial privilege; Henry VIII clauses — JCSI scrutiny; Lords Constitution Committee).
How it is applied in practice.
At the constitutional lawyer and parliamentary counsel level, practitioners contribute to Public Law; advise government (Government Legal Department HRA compatibility s.19 declarations; Law Officers — AG, SG — Gina Miller litigation — Article 50; Constitution Unit UCL; Institute for Government; JUSTICE constitutional casework); lead judicial review practice (Administrative Court — Upper Tribunal; Judicial Review and Courts Act 2022; Carter remedies — quashing orders — prospective quashing; standing — sufficient interest; privacy rights — DPA 2018 — Sugar v BBC); contribute to comparative constitutional design (Venice Commission consultations; Westminster Foundation for Democracy; International IDEA; LSE Paul Craig EU constitutional law); and advise Parliament on rights (JCHR — s.4 declarations — Belmarsh detainees A v SSHD 2004; remedial orders — fast track; prisoners voting — Hirst v UK).