https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/9/9.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/514/514.pdf
http://www.guengl.eu/news/article/eu-citizens-rights-and-status-of-north-of-ireland-must-be-prioritised-in-br
https://www.gov.uk/government/speeches/eu-speech-at-bloomberg