to form the quorum of the House required to hear and determine judicial business under ss.5&25 of the Appellate Jurisdiction Act 1876. In October 2009 the judicial functions of the House of Lords were transferred to the new Supreme Court of the United Kingdom under Part 3 of the Constitutional Reform Act 2005, with the twelve Lords of Appeal in Ordinary becoming the inaugural Justices of the Court. While ss.38 and 39 allow for additional judges to sit in the Court, Mackay's position as a serving judge of the Outer House of the Court of Session excluded him from both of these provisions. He retired from the membership of the House of Lords on 17 January 2017. See also List of Senators of the College of Justice References 1946 births 2018 deaths People educated at George Watson's College Alumni of the University of Edinburgh Scottish politicians Mackay of Drumadoon Mackay of Drumadoon Members of the Faculty of Advocates Members of the Privy Council of the United Kingdom Scottish King's Counsel 20th-century King's Counsel Solicitors General for Scotland Lord Advocates University of Virginia School of Law alumni Crossbench life peers