The subject of this first episode is constitutional thinking: what we mean by ‘Constitution’ and ‘Constitutional’ and how the nature of the United Kingdom constitution differs from other countries. Discussants are Stephen Gethins (formerly a Westminster MP, now Professor of Practice in International Relations, University of St Andrews), John Hudson (Professor of Legal History, University of St Andrews), Caroline Humfress (Director, Institute of Legal and Constitutional Research, University of St Andrews) and Colin Kidd (Professor of Modern History, University of St Andrews).