Supermarket Shopping Secrets - Episode Guide

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.

Gregg Wallace returns to lift the lid on the science behind how the supermarkets bring us our food. He is joined by journalist Babita Sharma as together they discover the impact the fiercest supermarket wars in history are having on the food in our shopping trolleys. In this episode, Gregg discovers the high-tech acoustic testing Asda are using to get an edge in the battle to bring us a perfect avocado, and he gets a lesson in social media by tormenting his taste buds with the world's hottest chilli. Meanwhile, Babita uncovers the intelligence gatherers who know more about what we buy - and why - than we do.

In this edition looking at health, Gregg discovers the exotic ingredient being used to produce a healthier burger and explores spiralised vegetables, now a major health trend. And Babita examines how the public is being manipulated by food health labels.

Gregg and Babita look at one of the fastest-growing battlegrounds - convenience. Gregg finds out what it takes to bring us the easiest ever fish and discovers how supermarkets decide where to open convenience stores. Babita travels to Spain on the trail of our favourite convenience fruit - the easy peeler.

Supermarket Secrets is going behind the scenes again to reveal how the supermarkets are using the latest technology and science to bring us our food. In this series, Gregg Wallace and consumer journalist Nikki Fox discover how much the Internet is transforming the way we shop and the food in our trolleys.

Tonight , the supermarkets fight to be the first with the latest food fashions. Gregg joins Tesco's Head of Plant Innovation as he invents new vegan meals that he claims will taste like meat, and sees how Asda are using ingenious growing techniques to make tomatoes sweeter than strawberries. Meanwhile, Nikki looks at the latest craze for sensory shopping.

This time, in an age when we expect everything delivered in an instant, how the supermarkets are working to bring us our food on demand. Gregg sees how Ocado are using robots to revolutionize online delivery and visits a state-of-the art lettuce farm in Norfolk where they supply 300 million lettuces per year exactly when we want them. Meanwhile, Nikki tests out the Co-op's new pay-in-the-aisle technology as we move towards a checkout-free future.

The supermarkets know that shoppers don't show much allegiance to them any more, so what techniques are they coming up with to keep us coming back?