
https://blogs.sussex.ac.uk/uktpo/2017/06/12/animal-welfare-and-post-brexit-trade/

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/650455/customs_bill_white_paper_print.pdf

http://blogs.lse.ac.uk/brexit/2017/09/28/the-eu-referendum-was-gerrymandered/