The subject of this episode is ‘justiciability’, exploring the relevant - judge-made - ‘rules’ with reference to recent, high-profile, litigation. Drawing on the direct experience of both discussants, the episode challenges the idea that there is a clear concept of justiciability currently in operation at either the national (UK) or international level.  Discussants are Aidan O’Neill QC (Scot.), QC (E&W), BL (Ireland) (https://www.matrixlaw.co.uk/member/aidan-oneill/ ) and Lorna Drummond QC (Sheriff in Tayside, Central and Fife, sitting at Dundee Sheriff Court, Sheriff of the Sheriff Appeal Court, and Temporary High Court Judge and Justice of the Court of Appeal of St Helena, Ascension Island and Tristan da Cunha). The episode is chaired by John Hudson (Professor of Legal History, University of St Andrews).