...in which we visit the far northeast of Cumbria to explore the remarkable history and remains of the Nenthead lead mines.

In the company of geologist and Nenthead Mines trustee Pete Jackson, we learn about the earliest mineral prospecting in the area, where 'the old men' sought out lead in becks, waterfalls and, latterly, artificial hushes.

Arriving at a centuries-old stone leat – still flowing – we consider the unusual addition of flag coverings, and nature's steady reclamation of spoil heaps.

Entering the hill at Carr's Level, we consider the boom years of the London Quaker Lead Company, and the values that gave rise to social housing and an early form of sickness pay.

Moving deeper into the mines – and through the evolution of extractive technologies, from hand-picking to dynamite – we proceed to the great depression that made Nenthead a truly European operation, where British, Italian, French and German miners mixed, mined and lived together.

We end our journey atop the mind-blowing 300-foot Brewery Shaft, where Pete describes the five-mile subterranean canal – once a tourist attraction – that links Nenthead to Alston.

• For more about Nethead Mine, and to find out about publ;ic open days, see nentheadmines.com/