The government is led by the prime minister (currently Boris Johnson, since 24 July 2019) who selects all the other ministers. The country has had a Conservative-led government since 2010, with successive prime ministers being the then leader of the Conservative Party.
What does the United Kingdom call their leader?
The Prime Minister is the leader of Her Majesty's Government and is ultimately responsible for the policy and decisions of the government. As leader of the UK government the Prime Minister also: oversees the operation of the Civil Service and government agencies.
Who Rules England?
This is another way of referring to the monarchy - which is the oldest part of the system of government in this country. Time has reduced the power of the monarchy, and today it is broadly ceremonial. The current UK monarch is Queen Elizabeth II.