> Present and former industrial workers basically all voted leave, while knowledge workers and finance voted remain.

Do you have a source for that claim?

According to The Australian:

"Leave was backed by almost two-thirds of those considered “working class and non-workers”, meaning skilled manual workers through to those with lower grade jobs, pensioners or welfare dependants."

http://www.theaustralian.com.au/news/inquirer/brexit-who-vot...