https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
http://www.ecfr.eu/article/commentary_the_brexit_threat_to_britains_defence_industry
https://www.bruegel.org/sites/default/files/2022-10/PC%2018%202022_1.pdf
https://constitution-unit.com/2022/09/06/boris-johnson-and-the-myth-of-getting-brexit-done/?mc_cid=95e6373cc2&mc_eid=815b1928ec