https://www.gov.uk/government/news/pms-open-letter-to-eu-citizens-in-the-uk
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/780/780.pdf
https://www.niesr.ac.uk/sites/default/files/publications/NIESR%20Report%20Brexit%20-%202018-11-26.pdf