https://institute.global/news/customs-and-exiting-european-union
https://www.nao.org.uk/wp-content/uploads/2022/05/Regulating-after-EU-Exit.pdf
http://blogs.lse.ac.uk/brexit/2017/09/28/the-eu-referendum-was-gerrymandered/
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/129/129.pdf