http://www.legislation.gov.uk/ukpga/2007/16/section/2Parliament (Joint Departments) Act 2007An Act to provide for joint departments of the Houses of Parliament; and for connected purposes.texttext/xmlenStatute Law Database2015-01-30Expert Participation2014-04-01 21The Corporate Officers' functions in connection with joint departments are exercisable by them only jointly.2Subsection (3) applies to—athe exercise of functions under section 1(1) or (3);bthe exercise of functions under section 1(2), if it changes the overall character of the services provided by the joint department.3In those cases—athe Corporate Officer of the House of Commons may act only with the approval of the House of Commons Commission;bthe Corporate Officer of the House of Lords may act only in accordance with recommendations made by the House Committee of the House of Lords and approved by that House.4In subsection (3)(b) the reference to the House Committee includes a reference to any committee the House of Lords designates instead of that Committee for the purposes of this section.