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this is one of the fundamental principles of all constitutions. It is the idea that there should be a clear demarcation in function between each of the three organs of state (executive, legislature and judiciary) and the powers of each should be held in check by the others.
In the UK the separation is often described as a fusion because of the incidence of overlap between these organs. These overlaps are regularly controlled by constitutional conventions.
this is enshrined in Article 15 of the European Convention on Human Rights and is therefore giving effect by the Human Rights Act 1998. It permits contracting parties (member states) to derogate from convention rights in times of war or public emergency. It has proved a popular tool for governments in their fight against terrorism. The House of Lords have been careful to ensure it is not used (or abused) lightly. See A v Secretary of State for the Home Department (2005).
Freedom of Association and Assembly: this is the right citizens have to associate and assemble. This right is enshrined in Article 11 of the European Convention on Human Rights and so given effect by the Human Rights Act 1998. The right is qualified and so can be restricted if it is in the public interest to do so. There also exist common law limitations to this right on the basis that someone is committing or threatening to commit a breach of the peace. Legislation (Public Order Act 1986) exists to limit the right to free assembly. Finally the Terrorism Act 2000 limits the freedom to associate by identifying proscribed organisations which citizens are not permitted to associate with.
Freedom of Expression: this is the right citizens have to free speech. This right is enshrined in Article 10 of the European Convention on Human Rights and so given effect by the Human Rights Act 1998. The right is qualified and so can be restricted if it is in the public interest to do so. The grounds for restriction include national security, censorship, contempt of court, defamation, public order and privacy.