
http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/224244/evidence-british-influence.pdf

https://www.nakedcapitalism.com/2018/02/another-brexit-mess-grandfathering-existing-free-trade-agreements-looks-unlikely.html