
https://conservativehome.com/2022/05/11/the-northern-ireland-protocol-the-options-boil-down-to-hoping-the-eu-backs-down-or-offering-it-a-new-deal/

https://www.progressivepolicy.org/blogs/trade-fact-of-the-week-americas-non-mfn-tariffs-on-natural-resources-are-usually-low/

https://www.nakedcapitalism.com/2018/02/another-brexit-mess-grandfathering-existing-free-trade-agreements-looks-unlikely.html