Depends what you mean by popular culture FD. I don't know if the Unthanks have done Breakfast TV but I'll guess they have. They've certainly done Woman's Hour and pop music radio. That's on the big radar.

Some things just need more exposure and a decent hook to hang the idea on, Buenavista Social Club's musicians spring to mind or the Oh Brother Where Art Thou sound track rehabilitating Old Timey in the popular consciousness. I don't believe there's anything antipathetic about folk music and popularity, if it entered the public consciousness via a film sound track or a brilliant documentary it would do well. It's just not very well sold as a product, so it occupies the area of good taste and discernment rather than instant recognition.