Gregg Wallace takes an exclusive tour of Kellogg's massive Manchester factory to discover, step-by-step, what it takes to produce a million boxes of cereal every day; Cherry Healey discovers how special nutrients are added to cereal.

Gregg Wallace follows 27 tons of potatoes from a farm in Hampshire, England, through the largest crisp factory on Earth, as they are peeled, sliced and fried to make more than five million packets of crisps every 24 hours.

Gregg follows the journey of 27 tons of dried haricot beans from North America to the largest bean factory in the world.

Gregg Wallace explores the largest bicycle factory in Britain, which produces 150 folding bicycles every 24 hours, and joins a multi-stage manual production line to make his very own bike.

Gregg Wallace lends a hand unloading a tanker of sugar, and follows its path through a factory to learn how the workers transform it into sweets.

Gregg Wallace joins a human production line in the largest sports shoe factory in the U.K. to see how they put together 27 different pieces made from eight different materials.