https://www.socialeurope.eu/brexit-shows-us-real-first-world-problems-look-like
https://www.socialeurope.eu/wp-content/uploads/2019/01/03_Brexit_Kroeger.pdf
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmbeis/909/909.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/637748/Future_customs_arrangements_-_a_future_partnership_paper.pdf