第一大蔵卿
The prime minister is "ex officio" also First Lord of the Treasury, Minister for the Civil Service and the minister responsible for national security. Indeed, 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. In 2019, the office of Minister for the Union was established with Boris Johnson becoming the first Prime Minister to hold this title.