https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
https://ec.europa.eu/commission/sites/beta-political/files/outline_of_the_political_declaration.pdf
https://uk.yahoo.com/news/brexit-still-wont-happen-says-legal-expert-claimed-article-50-never-triggered-104433721.html
https://blogs.lse.ac.uk/brexit/2019/10/15/the-curve-of-inequality-and-the-brexit-way/