https://rsf.org/en/ranking_table
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/695321/An_inspection_of_exit_checks.pdf
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
http://library.fes.de/pdf-files/bueros/budapest/15322-20190505.pdf