Prime Minister of the United Kingdom the convention developed that the Prime Minister should always sit in the lower house. As leader of the House of Commons, the Prime Minister's authority was further enhanced by the Parliament Act of 1911 which marginalised the influence of the House of Lords in the law-making process. The Prime Minister is "ex officio" also First Lord of the Treasury and Minister for the Civil Service. Certain privileges, such as residency of 10 Downing Street, are accorded to Prime Ministers by virtue of their position as First Lord of the Treasury. The status of the position as Prime Minister means that
Civil Service (United Kingdom) Crown working in a civil capacity who is not the holder of a political (or judicial) office; the holder of certain other offices in respect of whose tenure of office special provision has been made; [or] a servant of the Crown in a personal capacity paid from the Civil List". As such, the civil service does not include government ministers (who are politically appointed), members of the British Armed Forces, the police, officers of local government authorities or quangos of the Houses of Parliament, employees of the National Health Service (NHS), or staff of the Royal Household. As at the