High Quality Content by WIKIPEDIA articles! In the politics of the United Kingdom, the Cabinet is the collective decision-making body of Her Majesty's Government, composed of the Prime Minister and some 22 Cabinet Ministers, the most senior of government ministers. H.M. Ministers, and especially Cabinet Ministers, are selected primarily from the elected members of House of Commons, but also from the House of Lords, by the Prime Minister. (Only representatives and not public officers are directly elected in the UK) Cabinet Ministers are heads of government departments, mostly with the office of "Secretary of State for [Defence, or the relevant function]". The collective co-ordinating function of the Cabinet is reinforced by the statutory position that all the Secretaries of State jointly hold the same office, and can exercise the same powers. The Cabinet is the ultimate decision-making body of the executive within the United Kingdom system of government in traditional constitutional theory.