Television personality Rory Bremner journeyed underground at a Peak District cavern while filming for a new series.
The star was given a tour of the Treak Cliff Cavern at Castleton, home of rare Blue John stone.
Rory met Treak Cliff Cavern owner Vicky Turner and joined cavern guide Richard Taylor for a trip underground to see the largest known deposits of Blue John in the world.
Rory then got hands-on, joining the Treak Cliff cavern miners to extract some Blue John.
Vicky said: “Rory was fascinated to see the sparkling deposits of Blue John in the cavern and find out about how it is still mined to this day.
“He met our craftsmen who create some stunning ornaments and jewellery which we sell in the shop and export around the world.”
The presenter and political impressionist visited Treak Cliff while filming a new series, Rory Bremner’s Great British Views, in which he embarks on a tour of the British Isles.
The episode featuring the Peak District is due to be screened on ITV1 at 2pm on Monday.
Treak Cliff is unique among the show caves of Britain as both a historical Blue John mine and a natural cavern with formations of stalactites and flowstone.
It is also one of only two working Blue John mines in the world, providing Blue John for jewellery and ornaments, which is hand crafted in the workshops on site.