
https://www.instituteforgovernment.org.uk/sites/default/files/publications/5704%20IFG%20-%20Frictionless%20Trade%20Web.pdf

https://www.parliament.uk/documents/lords-committees/eu-select/Third-Interparliamentary-Forum-on-Brexit-statement.pdf

https://www.gov.uk/government/publications/information-about-the-withdrawal-bill