The subject of this episode is ‘Old Authorities and Contemporary Constitutions’, considering how and why certain works and specific figures from the past carry authority in contemporary constitutional arrangements and arguments. Discussants are Jim Gallagher (former Civil Servant who headed the Scottish Justice Department and was the UK government’s most senior adviser on devolution and other constitutional issues), Janet McLean (Professor of Law at The University of Auckland and Special Advisor to the Parliamentary Privileges Committee of the House of Representatives, New Zealand) and Aidan O'Neill (QC (Scot.), QC (E&W), BL (Ireland). The episode is chaired by John Hudson (Professor of Legal History, University of St Andrews).