 Kelly spent the second day thoroughly rehearsing this scene repeatedly, and it was filmed on the third day.The room was chosen to be "bright, uncomfortable and extremely claustrophobic", and the two characters are never shown in the same frame; as Stripe learns information, the room feels like it closes in on him.Both Kelly and executive producer Annabel Jones compared the episode to what they saw as rising xenophobia in Europe and America, exemplified by media descriptions of refugees as "swarms" of people, the Donald Trump 2016 presidential campaign and Brexit coverage.