6. Digging Liberty - Merton, London

Tony Robinson and the team are hunting for Liberty's first factory in South London. 'Liberty silks' still evoke images of opulence and beauty, of floating dresses and more leisurely times. But their hunt proves far from leisurely. Day three of the search brings the vital breakthrough – as well as an extraordinary attempt to recreate the 19th-century techniques of dying and printing those wonderful silks.