Key Facts

• Each year, McVitie's factories in Stockport and London make about 80 million packets of chocolate digestives.
• The factory in Stockport started making biscuits in 1917 and introduced the chocolate digestive eight years after that.
• According to Anthony Coulson, the general manager at the factory, the chocolate digestives should be eaten with the chocolate side facing down.
• The chocolate digestives were introduced 25 years after the plain digestives.
• The chocolate on the digestive biscuits is actually on the bottom, not the top, because the plain biscuits are dipped into a pool of chocolate.
• Lynn Loftus, a worker at the McVitie's factory for 36 years, believes the biscuit will continue to be popular for many more years.
• Craig Leech, who has been with McVitie's for 21 years, says he knows the products inside out. He first worked in the factory by adding the chocolate to the biscuits.