https://publications.parliament.uk/pa/cm200203/cmhansrd/vo021126/debtext/21126-17.htm
https://institute.global/news/customs-and-exiting-european-union
https://blogs.sussex.ac.uk/uktpo/2017/06/12/animal-welfare-and-post-brexit-trade/
http://ukandeu.ac.uk/wp-content/uploads/2017/06/One-year-on.pdf