https://www.socialeurope.eu/brexit-status-quo-ex-ante
http://UK Brexit And The Exterminating Angel
https://www.nakedcapitalism.com/2018/02/another-brexit-mess-grandfathering-existing-free-trade-agreements-looks-unlikely.html
https://www.instituteforgovernment.org.uk/sites/default/files/publications/5704%20IFG%20-%20Frictionless%20Trade%20Web.pdf