https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/365.pdf
https://ukandeu.ac.uk/trade-migration-and-brexit/
https://blogs.lse.ac.uk/brexit/2019/10/23/long-read-the-makings-of-brexit-and-the-road-ahead/
https://publications.parliament.uk/pa/cm200203/cmhansrd/vo021126/debtext/21126-17.htm