https://openeurope.org.uk/today/blog/what-would-a-no-deal-after-the-transition-period-look-like/
https://ukandeu.ac.uk/wp-content/uploads/2021/06/EU-UK-2030-Report.pdf
https://www.wto.org/english/res_e/reser_e/ullbergpresentation_e.pdf
http://www.consilium.europa.eu//media/32504/xt21004-ad01re02en18.pdf