United Kingdom: Political System, Government & Westminster Explained
The United Kingdom is a constitutional monarchy and parliamentary democracy. King Charles III is head of state but holds no partisan political power. The Prime Minister — Keir Starmer since 5 July 2024 — leads the government and must hold the confidence of the House of Commons. Labour won 412 of 650 seats in the July 2024 general election, the party's largest majority since 1997. The UK uses first-past-the-post voting across 650 single-member constituencies. Its constitution is uncodified — built from statutes, conventions, and case law rather than a single written document.
What stands out
- 11 different holders of Prime Minister of the United Kingdom in the last 25 years — average tenure 2.3 years.




