https://publications.parliament.uk/pa/bills/cbill/58-03/0204/220204.pdf
http://ukandeu.ac.uk/for-the-third-time-we-surveyed-mps-on-their-attitude-to-brexit-and-the-results-were-fascinating/
https://economy2030.resolutionfoundation.org/wp-content/uploads/2023/06/Trading-Up.pdf
https://www.iod.com/Portals/0/PDFs/Campaigns%20and%20Reports/Europe%20and%20trade/Business-of-Brexit.pdf?ver=2017-05-22-090428-150