https://library.fes.de/pdf-files/international/20258.pdf
https://unctad.org/news/post-brexit-uk-exports-could-fall-32-billion-due-non-tariff-measures-and-tariffs
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32019R0452&from=EN
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/387/387.pdf