2/7. Tin Town. A hundred years ago the Derwent Valley
Water Board founded Birchinlee, a complete town of corrugated iron in Derbyshire, to house workers building two massive dams. Today the dams remain, but the town of corrugated iron has gone. Archaeologist
Julian Richards investigates why the board built such an impressive home for the navvies, and whether this artificial town was a success. Producer John Byrne w