Great British Journeys - Thomas Pennant: A Tour in Scotland and Voyage to the Hebrides (1772)

Readers of pioneer, scientist and explorer Thomas Pennant's masterwork, A Tour in Scotland, learned about rocks that could overpower a compass or prove the real age of the Earth, and about a people teetering on the edge of starvation. Can Nicholas Crane piece together the route which Pennant took and solve the puzzle at the heart of it - why Pennant turned back at Ledbeg in Sutherland and undertook an 18-mile trek through rain, bogs and mountains to the obscure island of Inchmaree?