Dawn French narrates this behind-the-scenes look at Britain's biggest snack rivalries.
The snack aisle is a brutal place, where every cheesy puff, crisp and tortilla chip fights for its place on the shelf.
This episode meets the crisp industry's biggest players, whose job it was to make sure their brand stays ahead of the competition, no matter what. It's a fierce battleground where three British companies - Smiths, Golden Wonder and Walkers - have fought for decades to out-flavour, out-sell and outwit their rivals to achieve complete crisp domination.
The Secret World Of Crisps airs Sunday 15th August on Channel 4.