“If you’ve got the heart,” sang a suave Ewan Macintyre, “then you can be involved, you can be a part”. There was more heart in the room last night than you’d find in a whole tour of Mumford & Sons. And art. Nothing too flashy to begin, just lovely interwoven mandolins and fiddles, driven by guitar rhythms and their trademark bluegrass banjo. Southern Tenant Folk Union might have been playing in a boozer, but if people call these guys a jumped-up pub band, they've got it all wrong.