The Secret World of… Season 3 is yet to be announced by Channel 4

Jo Brand unwraps the stories of the most popular Christmas chocolate and the annual fight to be the best in a business where nostalgia means everything and a change from the norm can backfire spectacularly. Industry experts explain how Quality Street and Roses dominated the market until recent years where brands like Ferrero Rocher and Mars are taking control.

Jo Brand tears open the nostalgic story behind Britain's most popular breakfast cereals. Three British companies fought it out and shaped this market over decades: Kellogg's, Weetabix and Jordans. Now they battle it out as modern consumers prioritise nutrition, while new, independent rivals with big ideas compete for their own place at the breakfast table.

Jo Brand unwraps the nostalgic story of sandwiches and how this iconic snack evolved from a curly 1970s joke to today's modern, pre-packaged sandwiches. The brains behind the industry's biggest names reveal how the Marks & Spencer sandwich spawned a market fuelled by competition, with Pret a Manger revolutionising the look and feel of sandwich shops and the rivalry of mass-market mega chains Greggs and Subway, ensuring that the sandwich dominates our high streets.

Jo Brand unwraps the nostalgic story of the world of sweets and lifts the lid on the biggest rivalries and innovations that have driven the sweet world. Jo unpacks the historic rivalry between Rowntree's and Bassett's before the cosy British sweet market gave way to a bitter battle after the arrival of Mars and Haribo, and key players from some of the industry's biggest brands reveal just how fierce the battle is to keep life sweet.

Jo Brand tells the nostalgic story of burgers, hearing from the heavyweights behind some of the biggest brands and lifting the lid of an industry worth billions. The programme looks back at the battles between Wimpy, McDonald's and Burger King and examines how modern British companies are seeking to make the burger their own.

Jo Brand tells the nostalgic story of how Britain fell in love with ice-cream, in an episode that peeks behind the curtain of the nation's favourite frozen treat. The heavyweights of the industry reveal the battles fought to dominate freezers, from the earliest innovations of Wall's and Lyons Maid, to the sophistication of Mars and the introduction of high-end luxury from Haagen-Dazs to Ben & Jerry's.