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This chapter examines the general issue of leadership in the British political system and the stresses and strains of this task, examining the role of the prime minister. As well as being leader of the largest party in the House of Commons, able to command a majority, and potentially able to get government business through Parliament and into law, the prime minister has executive powers, which helps keep this focus. Despite the power of the position and its importance in the British system of government, there are fundamental weaknesses in the role that come from the instabilities of party politics. Overall, the picture of prime ministerial and core executive power and capacity is a mixed one that is changeable over time. In recent years, over Brexit and the Covid-19 pandemic, the prime minister's fate can change dramatically, even week-by-week.

This chapter discusses what makes British politics distinctive and recognizable: its parliamentary democracy, uncodified constitution, and pattern of party government. It begins by outlining some recent events that have made British or UK politics so fascinating and controversial. The chapter then describes the political system, particularly the institutional rules that affect what happens and govern how politics takes place. Parliament, composed of the House of Commons, House of Lords, and the Crown, is the supreme legal authority in the UK. The chapter also provides a summary of the British constitution. It places the UK in a comparative context, to be studied alongside other nation states. Finally, the chapter sets out the information and concepts that help in understanding the nature of and limits to British democracy.