Behind the doors of the Heinz factory in Wigan, where 850 people work around the clock to produce 200 different products, including soup, pasta and, of course, 450 millions of cans of baked beans every year. The documentary discovers the secrets of making food on this scale, meets workers including food tasters, apprentice engineers and the factory's own firemen, and also learns the story behind the famous Heinz 57 number.