Asimov in 1980 didn't have access to "Orwell, the Lost Writings", published in 1985. That details Eric Blair's ("Orwell" is a pseudonym) jobs during WWII, mostly at the British Ministry of Information. "1984"'s details are partly autobiographical. One of Blair's jobs was to translate news broadcasts into Basic English for broadcast to the colonies, primarily India and Hong Kong. He found that this was a political act. Squeezing news down to a 1000 word vocabulary required removing political ambiguity. It's hard to prevaricate in Basic English, which has a very concrete vocabulary. Hence Newspeak.

The details of Winston Smith's job are close to Blair's job. The rather bleak canteen matches the one at the Ministry of Information. A middle manager above Blair had the initials "B B", and that's where Big Brother comes from. The low quality gin, cigarettes, and razor blades are the WWII British experience.

"1984" is in some ways Dilbert, with more politics.