Government in Parliament Her Majesty's Government and the Crown Ministers and departments

Foreign powers

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  The power to ratify and make treaties.
  
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  The power to declare war and conclude peace with other nations.
  
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  The power to deploy the Armed Forces overseas.
  
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  The power to recognise states.
  
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  The power to credit and receive diplomats.
  

Even though the United Kingdom has no single constitutional document, the government published the above list in October 2003 to increase transparency, as some of the powers exercised in the name of the monarch are part of the Royal Prerogative. However, the complete extent of the Royal Prerogative powers has never been fully set out, as many of them originated in ancient custom and the period of absolute monarchy, or were modified by later constitutional practice.
Ministers and departments
Main article: British government departments
As of 2019, there are around 120 government ministers supported by 560,000 Civil Servants and other staff working in the 25 Ministerial Departments and their executive agencies. There are also an additional 20 non-Ministerial Departments with a range of further responsibilities.
Location

Main entrance of 10 Downing Street, the residence and offices of the First Lord of HM Treasury
The prime minister is based at 10 Downing Street in Westminster, London. Cabinet meetings also take place here. Most government departments have their headquarters nearby in Whitehall.
Devolved governments
Since 1999, certain areas of central government have been devolved to accountable governments in Scotland, Wales and Northern Ireland. These are not part of Her Majesty's Government, and are accountable to their own institutions, with their own authority under the Crown; in contrast, there is no devolved government in England.
Local government

Refurbishment notice at Old Fire Station, Oxford, showing HM Government support.
Up to three layers of elected local authorities (such as County, District and Parish Councils) exist throughout all parts of the United Kingdom, in some places merged into Unitary Authorities. They have limited local tax-raising powers. Many other authorities and agencies also have statutory powers, generally subject to some central government supervision.