https://www.wto.org/english/tratop_e/tpr_e/s434_e.pdf
https://www.economicstrategygroup.org/wp-content/uploads/2021/11/5-Bown.pdf
https://www.nakedcapitalism.com/2018/02/another-brexit-mess-grandfathering-existing-free-trade-agreements-looks-unlikely.html