The United Kingdom has three distinctly different legal systems, each of which derives from a particular geographical area for a variety of historical reasons: English law, Scots law, Northern Ireland law, and, since 2007, calls for a fourth type, that of purely Welsh law as a result of Welsh devolution, with further calls for a Welsh justice system.
Whilst the House of Lords of the United Kingdom is the upper chamber of Parliament and has government ministers, for many centuries it had a judicial function. It functioned as a court of first instance for the trials of peers and for impeachments, and as a court of last resort in the United Kingdom and prior, the Kingdom of Great Britain and the Kingdom of England.
The courts of Scotland are responsible for administration of justice in Scotland, under statutory, common law and equitable provisions within Scots law. The courts are presided over by the judiciary of Scotland, who are the various judicial office holders responsible for issuing judgments, ensuring fair trials, and deciding on sentencing. The Court of Session is the supreme civil court of Scotland, subject to appeals to the Supreme Court of the United Kingdom, and the High Court of Justiciary is the supreme criminal court, which is only subject to the authority of the Supreme Court of the United Kingdom on devolution issues and human rights compatibility issues.
The Supreme Court of the United Kingdom is the final court of appeal in the United Kingdom for all civil cases, and for criminal cases originating in England, Wales and Northern Ireland. As the United Kingdom's highest appellate court for these matters, it hears cases of the greatest public or constitutional importance affecting the whole population.
The courts of Northern Ireland are the civil and criminal courts responsible for the administration of justice in Northern Ireland: they are constituted and governed by the law of Northern Ireland.
The judiciaries of the United Kingdom are the separate judiciaries of the three legal systems in England and Wales, Northern Ireland and Scotland. The judges of the Supreme Court of the United Kingdom, the Special Immigration Appeals Commission, Employment Tribunals, Employment Appeal Tribunal and the UK tribunals system do have a United Kingdom-wide jurisdiction but judgments only apply directly to the jurisdiction from which a case originates as the same case points and principles do not inevitably apply in the other jurisdictions. In employment law, employment tribunals and the Employment Appeal Tribunal have jurisdiction in the whole of Great Britain.
Scots law is the legal system of Scotland. It is a hybrid or mixed legal system containing civil law and common law elements, that traces its roots to a number of different historical sources. Together with English law and Northern Irish law, it is one of the three legal systems of the United Kingdom. Scots law recognises four sources of law: legislation, legal precedent, specific academic writings, and custom. Legislation affecting Scotland and Scots law is passed by the Scottish Parliament on all areas of devolved responsibility, and the United Kingdom Parliament on reserved matters. Some legislation passed by the pre-1707 Parliament of Scotland is still also valid.
R (Miller) v Secretary of State for Exiting the European Union is a United Kingdom constitutional law case decided by the United Kingdom Supreme Court on 24 January 2017, which ruled that the British Government might not initiate withdrawal from the European Union by formal notification to the Council of the European Union as prescribed by Article 50 of the Treaty on European Union without an Act of Parliament giving the government Parliament's permission to do so. Two days later, the government responded by bringing to Parliament the European Union Act 2017 for first reading in the House of Commons on 26 January 2017. The case is informally referred to as "the Miller case" or "Miller I".
Lee v Ashers Baking Company Ltd and others[2018] UKSC 49 was a Supreme Court of the United Kingdom discrimination case between Gareth Lee and Ashers Baking Company, owned by Daniel and Amy McArthur of Northern Ireland. Lee brought the case after Ashers refused to make a cake with a message promoting same-sex marriage, citing their religious beliefs. Following appeals, the Supreme Court overturned previous rulings in favour of Lee and made a judgement in favour of Ashers. The court said there was no discrimination against Lee and that Ashers' objections were with the message they were being asked to promote. The court held that people in the United Kingdom could not legally be forced to promote a message they fundamentally disagreed with. The case became known in the British and Irish media as the "gay cake" case.