Martin Geissler sits down with SNP leader John Swinney. His party are coming into this general election off the back of what he himself described as a “rough time”. They’re offering voters “a new chapter”, with calls for more powers for Scottish Parliament, and eventually, they hope, full independence for Scotland, but given they’ve been in power in Holyrood for 17 years, how is that message landing with voters? In this audio version of the BBC Scotland Sunday Show interview, Martin asks Swinney about Scottish independence, taxation, and what exactly makes a mandate for a referendum.Part of a series of interviews with party leaders over the course of the general election campaign. To hear them all, subscribe to Podlitical on BBC Sounds.