In a narrow sense

In a narrow sense, a constitution means a system of rules that governs the relationship between different parts of government, such as how the powers are controlled. It also determines that between the state and the citizens .
The constitution in the UK might seem more abstract than most of the others as it is unwritten and uncodified. However, some specific characteristics could be easily distinguished. First, UK’s constitution is monarchical. This means most of the powers belong to Parliament and the central government, but the monarch, in terms of UK this would be the Queen, is still the head of state. Second, UK’s constitution is also unitary, which refers to the residence of the powers in the central institutions of the state. Due to this feature, all local institutions could be monitored by the central government .
UK’s constitution could be recapitulated that the powers within the state have been divided by the Queen, the executive, parliament and the judiciary. How these powers are distributed could be guided by several written constitutional sources, e.g. ”ordinary sources” such as the statute law; ”special sources” such as conventions, which are the rules that are not legally recognised by the court. For example, statute law, arguably being the most important source that impacts UK’s constitution, confers certain powers for parts of the government and protects the citizens .
In modern UK’s constitution, the Queen’s powers are diminished, due to the fact that most of her powers have been succeeded by the ”constitutional doctrines” of the separation of powers, the Rule of Law and parliamentary sovereignty. This is because of parliamentary sovereignty, which refers to the ultimate authority that monitors the UK’s constitution as a whole. A quote of Cockburn CJ could show the power of parliament to override other forms of power: ”There is no judicial body in the country by which the validity of an Act of Parliament could be questioned……”
The rest of the powers are now separated by the two branches of the judiciary and the executive. The judiciary accounts for making sure the government operates absolutely legally; the executive is responsible for advocating and carrying out policies . It is worth mentioning that the separation of powers precludes the power of each other being abused, which causes tensions between the two; while the parliamentary sovereignty regards Parliament as the top of the constitutional hierarchy . Also, UK’s constitution allows a person to work within these branches of state, the Queen herself is a member of all three branches . Last but not least, it is crucial for these constitutional doctrines to work with the two basic principles of the constitution – democracy, and accountability. Those who hold power in office must be elected to represent the will of people and must be accountable for how they utilise their powers .