Helen Skelton goes behind the scenes at Walkers crisps, meets celebrity spokesman Gary Lineker, and finds out what the company is doing about the number of crisp packets ending up in landfill. Helen also sets out to learn about the nutritional aspects of crisps and uncovers the lengths Walkers go to for the right crunch

Helen Skelton goes behind the scenes of McCain, the world's largest chip company and meets the voice of their advertising campaigns, Ricky Tomlinson. She also discovers the new products McCain is developing to appeal to the next generation, visits a farm that supplies McCain to find out how they are coping with the increasingly unpredictable weather, and gets access to a top-secret lab where the brand is testing new varieties of potatoes.