Which entity is responsible for ensuring the rule of law in the UK?

The entity responsible for ensuring the rule of law in the UK is the Supreme Court of the United Kingdom. This court serves as the highest court in the UK and plays a crucial role in interpreting the law, resolving legal disputes, and ensuring that laws are applied fairly and justly. It acts as a check on the powers of other branches of government, safeguarding the rights of individuals and upholding the principles of democracy and justice.

The Supreme Court's decisions contribute to the development of common law and provide authoritative guidance on important legal principles. By doing so, it helps to maintain the rule of law, ensuring that laws are applied consistently and that everyone is subject to the law, regardless of their status or position.

The other options, while significant in their respective roles, do not primarily focus on enforcing the rule of law. The House of Lords, for example, is a legislative chamber that primarily reviews and revises proposed legislation. The Prime Minister, as the head of government, has executive powers but does not directly ensure the rule of law. The Monarch has a constitutional and symbolic role, but the day-to-day enforcement and interpretation of law are the responsibilities of the judiciary, particularly the Supreme Court.