We are raiding the Audio Long Reads archives and bringing you some classic pieces from years past, with new introductions from the authors. This week, from 2016: The Trident debate is not simply about submarines and missiles. It touches almost every anxiety about the identity of the United Kingdom, and could tell us what kind of country – or countries – we will become. By Ian Jack. Help support our independent journalism at theguardian.com/longreadpod