Inside the Factory: Chocolate

The exploration of three household staples continues as Gregg Wallace goes inside a chocolate factory in York, which produces a staggering seven million bars every day. He follows the 24-hour journey from bean to bar and meets the people who work round the clock. Cherry Healey helps out on a production line in Derbyshire, where chocolate boxes are still made by hand, and historian Ruth Goodman delves through the archives to find out what it was like working in factories before machines took over