https://cer.org.uk/sites/default/files/bulletin_114_js_st_article1.pdf
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
https://www.niesr.ac.uk/sites/default/files/publications/NIESR%20Report%20Brexit%20-%202018-11-26.pdf
http://www.epc.eu/documents/uploads/pub_7865_realitybites.pdf