Lords Commissioners of the Treasury concomitant, so much so that the Prime Minister's official residence, 10 Downing Street, is in fact the official residence of the First Lord of the Treasury, which title is named on the letter box. Salisbury, as a marquess of vast independent wealth, had no use of an official residence, instead living in his grander town house at 20 Arlington Street in St James's, and could instead bestow it as a perquisite to other ministers, along with the First Lordship itself. Other positions have been linked to the Prime Ministership as well. Continuously since 1968, when the position was created by
Lords Commissioners of the Treasury an office in commission, technically all Lords Commissioners of the Treasury are of equal rank, with their ordinal numbers connoting seniority rather than authority over their fellow Lords Commissioners. However from at least the reign of Queen Anne de facto power has rested with the top-numbered Lords. Currently, there are eight Lords Commissioners of the Treasury: Of all the Lords Commissioners of the Treasury, typically the only one who actually works in HM Treasury in reality is the Second Lord, as Chancellor of the Exchequer. Since the formation of the office of Prime Minister (including in the case of Sir