https://www.socialeurope.eu/trump-and-brexit
https://curia.europa.eu/jcms/upload/docs/application/pdf/2018-12/cp180187en.pdf
https://ukandeu.ac.uk/wp-content/uploads/2021/06/EU-UK-2030-Report.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/899991/200713_BPDG_-_Border_Operating_Model_FINAL_1320_edit.pdf