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
Head of the Northern Ireland Civil Service Head of the Northern Ireland Civil Service There has been a Head of the Northern Ireland Civil Service since Sir Ernest Clark was appointed the first holder of that office in 1921. As of 2017 and according to the Executive Office, the Head of the 23,500-people strong NICS "has primary leadership responsibility for creating, developing and sustaining the NICS as an organisation which serves the devolved administration, the institutions of government and the people of Northern Ireland through the provision of high quality, cost effective services." The incumbent is also Permanent Secretary of the Executive Office and Secretary to the