archytele The Vault
Season guide

Inside the Factory: Series 4

9 episodes Premiered Jul 17, 2018 Updated Sep 18, 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.

Previously on Inside the Factory

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • Gregg Wallace and Cherry Healey visit some of the biggest factories in the UK.
  • Character alliances, factions, and personal loyalties undergo significant shifts under escalating stakes.
  • Addresses unresolved cliffhangers and thematic mysteries introduced during previous seasons.
  • Establishes the primary seasonal conflict that drives serialized character arcs toward the finale.

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.

Advertisement
Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

33%
67%
Mytharc (3): Crucial lore & season climaxes
Core (6): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

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 Core

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 Core

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 Core

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 Core

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 Core

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 Core

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 Mytharc

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 Mytharc

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