In the third episode of Jimmy’s quest to uncover the secrets lurking in the contents of the supermarket trolley, he finds out why there isn’t a creamy layer at the top of the milk any more.

He attempts to replicate the modern dairy process using a DIY production line set up in a barn. He uses clever chemistry to make his own version of supermarket spread and follows the egg’s journey from hen to supermarket. He is surprised to see some of the imperfect wrinkly eggs that never make it onto the shelves. At the cheese factory, he helps make Red Leicester cheese and learns that this is one factory where they actually put bacteria into the food.

Jimmy’s Food Factory is simulcast on the BBC HD channel – the BBC’s High Definition channel, available through Freesat, Sky and Virgin Media.