Coolies: How Britain Reinvented Slavery tells the astonishing and controversial story of the systematic recruitment and migration of over a million Indians to all corners of the Empire. It is a chapter in colonial history that implicates figures at the very highest level of the British establishment and has defined the demographic shape of the modern world.

Combining archive footage and historical evidence the programme includes interviews with Gandhi's great-grandaughter, Uma Dhupelia-Mesthrie, about Gandhi's campaign to end indentured labour and David Dabydeen - author and academic - whose great-grandfather was an indentured labourer in British Guyana.

Coolies: How Britain Reinvented Slavery traces family stories through epic voyages across South America, the South Pacific and Africa, as descendants investigate their past and trace the last surviving witnesses.