http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx
https://www.thecityuk.com/assets/2017/Reports-PDF/A-vision-for-a-transformed-world-leading-industry.pdf
https://www.gov.uk/government/speeches/eu-speech-at-bloomberg
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/695321/An_inspection_of_exit_checks.pdf