https://publications.parliament.uk/pa/cm201719/cmselect/cmpubacc/401/401.pdf
https://ecipe.org/wp-content/uploads/2023/10/PR-PB-112023.pdf
http://cdn.budgetresponsibility.org.uk/July_2017_Fiscal_risks.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/650455/customs_bill_white_paper_print.pdf