Gregg Wallace, Cherry Healey and Ruth Goodman look at the production, science and history of bread in Britain.

Gregg Wallace, Cherry Healey and Ruth Goodman look at Britain's love of chocolate and visit one of the world's largest chocolate factories in York.

Gregg Wallace, Cherry Healey and Ruth Goodman look at Britain's history with milk and visit one of the largest fresh milk processing plants on earth.

Gregg Wallace receives a load of corn fresh off the boat from Argentina and follows its journey through the largest breakfast cereal factory in Europe.

Gregg Wallace follows 27 tonnes of potatoes from a farm in Hampshire through the largest crisp factory on earth.

Gregg Wallace helps to unload 27 tonnes of dried haricot beans and follows them on a journey through the world's largest baked bean factory.

Gregg Wallace visits Britain's largest bicycle factory, which produces 150 folding bikes every day, and joins a production line to make his own bike.

Gregg Wallace helps to unload a tanker full of sugar from Norfolk and follows it through one of the oldest sweet factories in Britain.

Gregg Wallace visits the UK's largest sports shoe factory to see how they produce 3,500 pairs of trainers every day.

In this Christmas special, Gregg Wallace, Cherry Healey and Ruth Goodman explore the fascinating factory processes and surprising history behind our favourite festive treats.

Gregg Wallace receives some tea leaves from Kenya and follows them through the factory that produces one quarter of all the tea drunk in Britain.

Gregg Wallace is at the world's largest dried pasta factory in Italy, where they produce 150,000 kilometres of spaghetti each day.

Gregg Wallace follows the production of chocolate digestives and discovers that we are all eating them the wrong way up.

Exploring the fascinating factory processes behind Christmas cake, baubles, brandy and more. And why Christmas tree lights are called fairy lights.

Gregg Wallace explores the Grimsby factory that processes 165 tonnes of fish a week and produces 80,000 cod fish fingers every day.

Ruth Goodman investigates the origin of Worcestershire sauce, as told by Mr Lea and Mr Perrins.

Gregg Wallace explores Ribena's Gloucestershire factory. Meanwhile, Cherry Healey is in the lab figuring out why fizzy drinks are so appealing.

Gregg Wallace is in Derbyshire at an enormous coffee factory where they produce 175,000 jars of instant coffee every day.

Gregg Wallace explores the factory that makes 700,000 toilet rolls a day and Cherry Healey gets the bum deal of following a flush through the sewers.

Gregg Wallace explores a factory that produces 625,000 sausages a day and Cherry Healey gets the scientific lowdown on getting the best banger.

Gregg Wallace explores the Nottinghamshire factory that produces 250,000 jars of curry sauce each day. Cherry Healey helps harvest chillies.

In this Christmas special, Gregg Wallace visits a factory which produces a staggering two million tins of festive chocolate assortments a year.

Gregg Wallace is in Lowestoft at an enormous frozen food factory, where they produce one million potato waffles a day.

Gregg Wallace is in Italy at an enormous pizza factory, where they produce 400,000 frozen pizzas each day.

Gregg Wallace is in Burton upon Trent at Britain’s biggest brewery, where they produce 3 million pints of beer a day.

Gregg Wallace is in Germany at a historic pencil factory where they produce 600,000 writing implements a day.

Gregg Wallace is in Gateshead at a cheese factory where they produce 3,000 tonnes of spreadable cheese every year.

Gregg Wallace is in Derbyshire at an enormous cherry bakewell factory, where they produce 250,000 of the little tarts a day.

Gregg Wallace is in South Shields at a clothing factory where they produce 650 waxed jackets a day.

Gregg Wallace is in France at an enormous croissant factory where they produce 336,000 flaky pastries a day.

Gregg Wallace is in Leeds at an enormous mattress factory that produces 600 bouncy beds every day. Meanwhile, Cherry Healey learns whether there are benefits to be had from taking an afternoon nap.

Gregg Wallace is in Nottingham at an enormous party food factory where they produce 200,000 canapes every 24 hours.

Gregg Wallace is in Cornwall at an enormous bakery where they produce 180,000 pasties a day.

Gregg Wallace is in France at an enormous foundry that produces a cast iron pot every five seconds.

In Wigan, Gregg Wallace visits an enormous soup factory, which produces two million tins a day.

Gregg Wallace is in Ireland at an enormous liqueurs factory that produces 540,000 bottles a day.

Gregg Wallace is in Essex at an enormous cereal bar factory, which produces 400,000 fruit- and nut-packed treats a day.

Gregg catches up with the Essity paper mill in Manchester, which he visited back in 2018. The coronavirus crisis caused a huge spike in toilet roll sales.

Gregg reconnects with the Heinz baked beans factory in Wigan which he visited back in 2016. The coronavirus crisis caused a massive spike in the sales of tinned goods, and the baked beans factory upped production to deliver almost 50 million cans in just one month, nearly double the amount of tins they would normally sell in the same period.

Gregg reconnects with the Walkers crisps factory in Leicester, the largest crisp factory in the world, which he visited back in 2016. We Brits love a snack, and when the coronavirus crisis hit, sales of packet treats rose by 32% as shoppers spent more than £63 million in just one week.

Gregg reconnects with the Typhoo tea factory in the Wirral near Liverpool, which he visited back in 2017. The coronavirus crisis caused tea bag sales to soar, and the factory has upped production to produce 109 million tea bags in a week, an increase of 28 million. Throughout the episode, Gregg looks back over his original visit to the factory and the whole production process. First, he helps unload 24 tonnes of dried tea from Kenya and then follows its journey through the 28,500-square-metre factory to make the nation's favourite - good, old-fashioned builder's tea. Meanwhile, Cherry Healey travels to Kenya to see how the tea crop is picked, processed and shipped over 4,000 miles to the UK. She also learns how to master the art of making the best tea bag brew, revealing the top tips for a perfect cuppa. And historian Ruth Goodman explores how tea kept up morale during World War II.

Gregg Wallace reconnects with the McVitie’s factory in Harlesden, north west London, which he visited back in 2017. The coronavirus crisis caused a huge spike in the nation's desire for sweet treats, and sales of the firm’s chocolate digestives rose by 71 per cent, meaning in just two months, they sold an astonishing 12.5 million packets.

Gregg Wallace visits the world’s biggest cider producer, which produces more than 350 million litres each year.

In the second episode of the series, Gregg Wallace visits a sock factory in Leicester that produces one and a half million socks annually.

Gregg Wallace visits a factory in rural Somerset that produces one million pots of it every twenty-four hours, while Cherry Healey helps out with the UK’s biggest blackcurrant harvest.

Gregg Wallace visits the Woodmansterne card factory in in Watford. It’s one of the largest greeting card companies in the UK, a family business sending out 35 million cards a year. He gets stuck into all aspects of the card creation process - from sketching a card design, to creating an aluminium plate for the printing process, to the guillotining of the sheets into cards and the final shipping process, which takes the cards as far afield as Australia and Singapore. Meanwhile, Cherry Healey creates a vegan Christmas feast, and historian Ruth Goodman unwraps the story of the year when Christmas was cancelled

Gregg visits the Woodmansterne card factory in in Watford. It’s one of the largest greeting card companies in the UK, a family business sending out 35 million cards a year.

Gregg Wallace and Cherry Healey get special access to a factory that makes as many as a hundred iconic yellow diggers every single day.

Gregg Wallace visits the largest malt loaf factory in the world, encountering a production line of massive dough mixing, mind-boggling tin filling and intensely hot baking.

Gregg Wallace visits the Ercol factory in Buckinghamshire to follow the production of a Windsor chair. Meanwhile, Cherry Healey investigates how sitting too much could be very bad for our health.

Gregg Wallace visits a bootmaking factory in Wollaston, Northamptonshire to follow the production of a pair of Dr. Martens, while Cherry Healey gets to grips with the machines that make shoelaces.

Gregg Wallace visits the biggest tortilla factory in Europe, while Cherry Healey takes on the hottest chilli in the world and Ruth Goodman reveals how the Elizabethans treated their ruff collars.

Gregg visits the Denby factory in Derbyshire. Brits drink 195 million mugs of tea and coffee every day, so Gregg is following production of one of the factory’s best sellers, the Halo Heritage mug.

Gregg visits a factory that churns out fifty thousand litres of dairy ice cream every day, while Cherry Healey enlists an ice hockey team to test the best methods of stopping brain freeze.

Gregg Wallace visits a huge vacuum cleaner factory in the heart of Somerset and follows their biggest seller, the Henry vacuum cleaner in bright red.

When he was a child, Gregg loved playing with toy trainsets. Now he's got special access to learn how the ultimate model is made: a huge 187 tonne, five carriage electric train. Historian Ruth Goodman is energised by the history of electric trains.

Gregg Wallace gets exclusive access to a factory that builds red London buses, while Cherry Healey visits a bus windscreen factory and Ruth Goodman learns about London’s earliest double-deckers.

Gregg Wallace visits a factory that churns out 1.4 billion Jaffa Cakes a year, while Cherry Healey is in the city responsible for growing the fruit that gives these cakes their name.

Gregg Wallace explores the Vale of Mowbray pork pie factory, which began making pork pies in 1928. Cherry Healey reveals hacks for the perfect vegan shortcrust pastry.

Gregg Wallace visits a factory making 432 million crumpets every year. Cherry Healey learns the science of making batter for pancakes, and Ruth Goodman reveals how crumpets got their bubbles.

Gregg visits a factory that churns out up to 90,000 vegan sausages a day, while Ruth Goodman uncovers the green shoots of the vegetarian movement in Britain.

Gregg Wallace explores the Ambrosia factory in Lifton, Devon, to reveal how it makes up to 360,000 rice puddings every single day.

Gregg visits a factory that churns out 32 million mints per day. Cherry Healey visits the largest sugar beet factory in Europe, and Ruth Goodman explores minty mouthwash marketing.

Gregg Wallace steps inside a huge Yorkshire puddings factory in Hull to learn how Aunt Bessie’s produces a staggering 500 million Yorkshire puddings every year.

Gregg Wallace visits a jelly beans factory in Dublin to reveal the astonishing processes used to make ten million of these colourful little sweets every day.

Gregg Wallace visits two factories in Italy and Wales to learn how denim cloth is made and then transformed into one of the world's most popular items of clothing - jeans.

Gregg Wallace visits a food factory in Hertfordshire that produces 500 million parcels of stuffed pasta every year.

Gregg Wallace visits a huge brewery in Dublin to learn how two million litres of an iconic Irish stout are produced every day.

Gregg Wallace visits the colourful and fragrant Lush factory in Dorset to learn how an astonishing 14 million bath bombs are produced every year.

Gregg Wallace visits a huge carpet factory in Devon to learn how it weaves 46,000 square metres of carpet every year.

Gregg Wallace visits an enormous factory in York to learn how millions of peppermint-flavoured bubbly chocolate bars are produced every year.

Gregg Wallace is in West Yorkshire, visiting a huge factory that makes more than 5,000 sofas every year. Meanwhile, Cherry Healey learns about the science of light bulbs.

Gregg Wallace visits a colourful factory that produces 200,000 litres of paint and 10,000 metres of wallpaper every week.