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Season guide

Inside the Factory: Series 4

9 episodes Premiered Jul 17, 2018 Updated Jul 27, 2026

Inside the Factory is a British television series produced by Voltage TV for the BBC. The series features Gregg Wallace and Cherry Healey, although in season 4, Paddy McGuinness joins Cherry Healey. The program provides exclusive access to some of the largest factories in Britain, revealing the secrets behind various products. The series is a documentary that showcases the inner workings of these factories.

Season overview

Inside the Factory is a British television series produced by Voltage TV for the BBC. The series features Gregg Wallace and Cherry Healey, although in season 4, Paddy McGuinness joins Cherry Healey. The program provides exclusive access to some of the largest factories in Britain, revealing the secrets behind various products. The series is a documentary that showcases the inner workings of these factories.

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Episodes

S4·E1

Coffee

Jul 17, 2018 · 59 min

How a factory in Derbyshire produces 175,000 jars of instant coffee every day, from green coffee beans to the freeze-dried final product. How roasting alters the chemical compositi

S4·E2

Toilet Roll

Jul 24, 2018 · 59 min

How a factory in Manchester produces 700,000 toilet rolls a day starting with spruce timber offcuts from Sweden, pulped and rolled onto 1.2-tonne 'mother reels'. How the water trea

S4·E3

Sausages

Jul 31, 2018 · 59 min

How a factory in North Yorkshire produces 625,000 sausages a day, using machines that can fill 600 sausages in a minute. How low and slow shallow frying delivers the best combinati

S4·E4

Curry

Aug 14, 2018 · 59 min

How a factory in Nottinghamshire produces 250,000 jars of curry sauce each day. How chillies are harvested on small farms in India, dried, packed down, and processed into chilli po

S4·E5

Potato Waffles

Feb 26, 2019 · 59 min

How a factory in Lowestoft produces 450 tonnes of frozen food each day. The differences between waxy and floury potatoes, and which you should use for which job. How the potato's n

S4·E6

Pizza

Mar 5, 2019 · 59 min

How a factory in Italy produces 400,000 frozen pizzas each day. The science that makes mozzarella work so well on pizza. How pork is transformed into pepperoni. How freezer ships a

S4·E7

Beer

Mar 12, 2019 · 59 min

How Britain's biggest brewery produces 3 million pints of beer a day in Burton upon Trent. How four basic ingredients – water, malted barley, hops and yeast – are manipulated to ma

S4·E8

Pencils

Mar 19, 2019 · 59 min

Gregg Wallace is in Germany at a historic pencil factory where they produce 600,000 writing implements a day. Cherry Healey examines the astonishing properties of graphite. Histori

S4·E9

Cheese

Mar 26, 2019 · 59 min

How a cheese factory in Gateshead produces 3,000 tonnes of spreadable cheese every year - making cheddar, chopping and blending it with whey, water, and other ingredients. How bact