If you can get BBC iplayer :
Helen Mark is joined by John Copper, his sister Jill and her husband Jon Dudley, of the singing Copper Family.
Some interesting stuff in between too but CF open & close the 30min. :

http://www.bbc.co.uk/iplayer/episode/b012j8pp/Open_Country_The_South_Downs_An_Inspirational_Landscape/