Mud, Sweat and Tractors: The Story of Agriculture

The documentary series looking at the history of 20th-century farming in Britain opens by focusing on milk.

In the early years of the century, 150,000 dairy farmers milked by hand and sold milk door to door. By the end of the century, the 15,000 that were left were breeding cows that increased yields by 400 per cent and milk was sold through supermarkets. (Source: BBC)