As a white, middle-class, male brought up in the suburbs of SW London; singing Brigg Fair, The Four Loom Weaver of The banks of Sweet Primroses in my usual speaking voice just sounded ridiculous. However trying to imitate a regional accent was just as bad hence the 'folk revival voice'; silly but inevitable in the days of mass communication I suppose Sam Larner, Phil Tanner and the like had less of a problem with that!