Supermarket Secrets

We buy a staggering 90% of our food from supermarkets, and they have a huge influence over our lives. Gregg Wallace goes behind the scenes with Britain's biggest food retailers over the course of a year to discover how they source, make and move the food we find on the supermarket shelves. He has exclusive access to the buyers, product developers, food technologists and backroom teams, and gets the insider's guide to how much they know about us and our tastes. In this, the first of four episodes, Gregg reveals how the supermarkets bring us our summer favourites. He finds out why there is more than meets the eye in a supermarket strawberry, what it takes to bring us our barbeques, and how they stay one step ahead of the weather.

Gregg Wallace reveals how the supermarkets get us in the mood for autumn. He finds out what it takes to bring us millions of Halloween pumpkins, learns how own-label pies are made and is let into the hidden world of online supermarkets.

Gregg reveals how the supermarkets gear up for the biggest challenge of their year - Christmas. He sees what it takes to deliver millions of turkeys, finds out about the battle to make sprouts a crowd pleaser, and discovers how the supermarkets make sure we have got enough of our favourite Christmas tipple.

With spring in the air, Gregg finds out what it takes to bring us millions of eggs for Pancake Day, discovers the clever technology behind Easter chocolate and reveals what our eyes tell us about the way we shop.