9 behind the scenes facts about Black Mirror on Netflix

• Charlie Brooker teases Black Mirror's San Junipero may get a sequel
• Doctor Who’s Jodie Whittaker opens up about 'dark and fascinating' Black Mirror role
• When is Black Mirror Season 5 released on Netflix? Who is in the cast? What is going to happen?

The book discusses the dark workings behind Brooker’s brainchild, unveiling new insights into the show ahead of the release of season five.

Here’s just a snippet of what we learned from Inside Black Mirror...

Black Mirror's 'pig' episode was inspired by I'm a Celebrity

The National Anthem, the visceral episode where fictional prime minister Michael Callow finds himself on, shall we say, the trotters of a dilemma, was partly inspired by I’m a Celebrity…Get Me Out Of Here! – and aims to explore the public’s appetite for humiliation.

Brooker explained, “I was watching somebody [on I'm a Celebrity] – I can't remember who – but they were absolutely terrified. At one point it cut to Ant and Dec, and I thought Dec looked infinitely sad, like he’d gazed into the abyss.”

The episode, affectionately dubbed by fans “the one where the Prime Minster f***s a pig” was fraught with problems – from choosing which animal Callow is forced to do the dirty with to making sure Brooker managed to hit the right tone. After contemplating several other options (including sex with a chicken instead), they settled on a pig – who was called Madge, by the way.

San Junipero was originally about a heterosexual couple

However, after Brooker and Jones developed the script, they realised a lesbian couple would be a better fit.

“It was the idea of having a life unfulfilled,” said Jones. “You’ve been in a coma for 40 years, and going back to a time where maybe you couldn’t have been so sexually free as you could today.”

The script originally was set to finish when Kelly visited Yorkie in hospital, giving her a kiss on the forehead – but Brooker enjoyed writing the episode so much that he just kept going, giving us the rarest gift of all: a happy ending to a Black Mirror episode.

However, that might not be the end of it: Brooker has hinted he may write a sequel to San Junipero.

Black Mirror gave Get Out its star

Daniel Kaluuya scored the lead role in 2017’s critically acclaimed horror Get Out thanks to his powerful speech as Bing in 15 Million Merits. Good to know director Jordan Peele is a Black Mirror fan...

Waldo was based on Boris Johnson

Irritating cartoon figure Waldo, from The Waldo Moment, was based on Tory MP and former Mayor of London Boris Johnson, with some elements of Ali G thrown in for good measure. Any President Donald Trump similarities? That's just... coincidence...

Domhnall Gleeson's character in Be Right Back has a very significant name

Hayley Attwall and Domhnall Gleeson (who play Martha and Ash in Be Right Back) bonded before filming by going for dinner at the Dans Le Noir restaurant in Farringdon, London, where diners have to eat their meal in the dark. Appropriate.

Ash is also called Ash for one very simple reason, which Brooker describes in characteristically blunt terms.

“It’s because he f****** dies, almost straight away,” he said.

Jodie Foster had never watched Black Mirror before directing an episode

It wasn't until Foster was sent to script for Arkangel – the eerie episode which sees a mother spy on her child and monitor what material she can see – that she decided to give the show a try.

After positively drinking up the script, Foster turned her attention to the rest of the Black Mirror canon, particularly enjoying Shut Up and Dance, White Christmas and The National Anthem.

Why Crocodile is called Crocodile

Brooker explains that the name comes from an analogy for an earlier incarnation of the script.

“Imagine your life is a simulated boat ride,” said Brooker. “If you’re really unlucky, imagine a crocodile attacks you in the first minute. You think, from that point on, I could get attacked at any moment.

“That’s what Crocodile is: an analogy for somebody who has been traumatised at an early age, and might be troubled by life forever and never able to relax. The title stuck, even though the story completely changed. It’s weirdly fitting.”

The robot dogs in Metalhead originally had human masters

The faceless and utterly terrifying robot dogs in Metalhead were originally meant to be controlled by a drone operator in America – a seemingly normal man with a pregnant wife and kids.

However, Brooker and Jones removed the sequence from the episode after they felt it didn’t add anything – and the mysterious motives of the robot dogs only heighten the tension and fear of the episode.

The Black Museum cast deliberately fell out with each other during filming

Douglas Hodge, who played Rolo in Easter egg-fuelled episode Black Museum, really committed to the role of the nasty curator. He reveals how he was rude to co-star Letitia Wright off screen in order to foster an animosity that would transpire on screen.

“On the first day, Letitia came up to me and asked if I wanted to rehearse our lines,” he said. “I just said no. She said, ‘No-one has ever said that to me before,’ and I said, ‘Well there we are’ and walked away. After that, I think she was quite nervous, but I did it to help me inhabit Rolo and to help her hate him.”

“I was heartbroken!” Wright added. “Sometimes before takes, Doug would look at me and growl.”

Inside Black Mirror, published by Ebury Press, is out now