Inside the Factory

Gregg Wallace is in the UK's city of chocolate, York, exploring how the Nestle factory makes more than 8 million bars of chocolate every day. The bar he's following is the one packed full of bubbles - the peppermint-flavoured Aero.

Meanwhile, Cherry Healey is in the Berkshire countryside, learning how a cocoa plant quarantine facility is preventing a worldwide chocolate shortage. And historian Ruth Goodman is serving up the bitter history of drinking chocolate.

Gregg Wallace explores the HSL factory in West Yorkshire to find out how they make more than 5,000 sofas every year. The huge site has 250 staff dedicated to furniture making. Gregg is following the production of one of their best-selling sofas, the Burros Classic in indigo.

Cherry Healey learns about the science of light bulbs to create the perfect environment to snuggle up on the sofa and visits a foam factory to see how comfy padding is produced in just a few minutes.

Historian Ruth Goodman takes a front row seat to discover the history of the sofa and stitches together the fascinating story of one of the world's most famous sewing machines.

Gregg Wallace explores the Farrow & Ball factory in Dorset to learn how they produce up to 200,000 litres of paint and 10,000 metres of wallpaper a week. They make 270 different coloured paints, but Gregg is learning how they make ‘sulking room pink'.

Meanwhile, Cherry Healey discovers how a key ingredient in the paint-making process is mined at a huge china clay mine in Devon and learns the art of hanging wallpaper at a DIY school.

And Ruth Goodman is in the Lake District, exploring the history of wallpaper, and visits Portsmouth to uncover the extraordinary story of how ships in the First World War were painted with dazzling patterns to evade German submarines.