5. The Separation of Powers
Titles in the Complete series combine extracts from a wide range of primary materials with clear explanatory text to provide readers with a complete introductory resource. The separation of powers is a theory or a doctrine that describes how a state organizes the distribution of power and function between its different branches. It is often used as an umbrella term to denote the extent to which the three ‘powers’ in, or branches of, the state are fused or divided—that is, the legislative, the executive, and the judicial powers. This chapter begins by sketching the history of the separation of powers in the UK. It then discusses the purpose of the separation of powers; the similarities and differences between different theories of the separation of powers; the impact of recent constitutional reform on the operation of the separation of powers in the UK; how courts have interpreted the separation of powers; and the relevance of the separation of powers today including in the context of the balance of power between the executive and Parliament as regards the UK’s decision to exit the EU.