This chapter examines the structure and role of central government, with the latter part focusing on the key constitutional requirement that the government is accountable to the people through Parliament, reflecting the democratic nature of the constitution. The phrase ‘central government’ refers to the Prime Minister, Cabinet, ministers, government departments, and civil servants. Informally, these parts of central government are often referred to as ‘Whitehall’, reflecting how most government departments and the Prime Minister are based around that area of central London close to Westminster. A more constitutionally appropriate phrase is the ‘executive’. However, this term can also be taken to mean other elements which include the governments of Scotland, Northern Ireland, and Wales, as well as local government and organisations such as the police.