Bassist Paddy Gordon, of band Brier - whose songs feature on CD A Feast of Irish Folk - told the BBC News website he was "very, very distressed" when he discovered it was being sold on the BNP site.

He found out when a Musicians' Union colleague e-mailed him "saying he was very concerned and wondered why I was supporting the party".

BNP deputy chairman Simon Darby said "There's nothing they can do legally, once they release that music through their distributor, that's it."

Other folk artists whose work is featured include The Albion Band and Magna Carta

Earlier this year, it was reported that singer Dame Vera Lynn, 92, was outraged that compilation album The White Cliffs of Dover, featuring her song of the same name, was being sold on the site.

The album is still available to buy on the site.