Episode details
Available for over a year
Mr Harrison explains how a seam of Blue John stone was found after 68 years of looking.
Programme WebsiteUse ÃÛÑ¿´«Ã½.com or the new ÃÛÑ¿´«Ã½ App to listen to ÃÛÑ¿´«Ã½ podcasts, Radio 4 and the World Service outside the UK.
Available for over a year
Mr Harrison explains how a seam of Blue John stone was found after 68 years of looking.
Programme Website