https://www.socialeurope.eu/brexit-can-be-stopped-but-the-window-of-opportunity-is-closing-fast
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/780/780.pdf
https://www.gov.uk/government/news/pms-open-letter-to-eu-citizens-in-the-uk
https://www.theguardian.com/politics/2017/sep/04/uk-trade-deals-after-brexit-theresa-may-eu