Watch The Secret World of Snacks

Jo Brand narrates this nostalgic, behind the scenes look at the battles between our favourite Christmas chocolate brands. Industry heavyweights reveal how they fight for supremacy in an unforgiving sales window that lasts for just three months every year.

There's no more important meal of the day and this episode charts the rise and rivalries of our favourite cereals. Narrated by Jo Brand, we meet the key brains behind the most iconic breakfast brands and learn hear about the battles that gave us the cereal winners.

Jo Brand tells the story of the fight to be Britain's sarnie supremo. From the first M&S pre-packaged sarnies, to Pret A Manger's sandwich shop revolution and the mass-market appeal of Subway, industry insiders lift the lid on the industry's closest kept secrets and business battles.

Jo Brand peeks behind the curtain of the world of sweets and 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.

Jo Brand tells the story of Britain's love for burgers, from Wimpy, McDonald's and Burger King, to the modern players Honest Burgers and Meat Liquor. Industry titans reveal the rivalries that have seen the burger business come to be worth billions.

Jo Brand narrates this behind the scenes look at the battles between our favourite ice-creams. The creative brains behind some of our most iconic frozen treats reveal exactly what it takes to win the very cold war.