The group visited the pits near St Austell in the centre of Cornwall, where china clay (kaolin) is still being extracted.

A sky tip, known as the White Pyramid (photo: Simon Bayliss)

Photo: Anna Best

Photo: Phil Rushworth

Photo: Simon Bayliss

Photo: Anna Best

Photo: Anna Best

Photo: Oliver Sutherland

Photo: Phil Rushworth

Photo: Oliver Sutherland

Photo: Phil Rushworth

Hermit’s chapel, Roche Rock

A baby adder Photo: Simon Bayliss

Photo: Simon Bayliss