https://capx.co/why-has-boris-become-the-standard-bearer-of-the-tory-right/
http://www.diw.de/documents/publikationen/73/diw_01.c.562050.de/17-29.pdf
https://publications.parliament.uk/pa/cm200203/cmhansrd/vo021126/debtext/21126-17.htm
http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx