What is the Official governmental system of UK?

Unitary parliamentary constitutional monarchy

The United Kingdom is a unitary parliamentary constitutional monarchy. This means that the country is governed by a single, central government, rather than by individual states or regions. The Parliament of the United Kingdom is the supreme legislative body, and it is composed of the House of Commons and the House of Lords. The head of state is the monarch, who is currently Queen Elizabeth II. The prime minister is the head of government, and they are appointed by the monarch.

Copyright Wanderlust World © https://www.ynyoo.com