This is such a fascinating & personally inspiring time for me as a programmer.

The real game Bandersnatch (as a business folly) was something else - the "coming soon" advert from just before Imagine's bankruptcy would probably ring an alarm bell now - https://nosher.net/archives/computers/imagine_eugeneevans_yo...

Some of the programmers of Bandersnatch did release Gift From The Gods from the ashes of Bandersnatch - which I definitely had on my Spectrum! But it was very confusing - https://www.crashonline.org.uk/13/giftgod.htm

This 1984 documentary from the BBC archive covers Imagine's growth & demise, must have been a great visual reference for Brooker making the show, and the top comment has some more detail on Imagine's hiring spree - https://www.youtube.com/watch?v=buuUZFh_pyk also also check out 4:30 or so, where they show the game and the device that will "eventually be reduced to a small cartridge and sold with the game"!!

Also also the name Ritman is probably a reference to Jon Ritman, programmer of the brilliant Head Over Heels. But he was nothing to do with Imagine. He still gives interviews and seems lovely.