Last day it's available & won't be to everyone's taste (plus their geography is questionable - looking at Ribblehead Viaduct from Honister slate mine), but they do visit Blue John Caverns & Mother Shipton's:
https://www.channel4.com/programmes/sightseers/on-demand/44321-001

An amusing black comedy.

We enjoyed it immensely.

Cracking, dark comedy.
Quote of the film..after bludgeoning a guy: 'He's not a person, he's a Daily Mail reader!'