
https://csis-website-prod.s3.amazonaws.com/s3fs-public/2024-05/240506_DIIG_Expanding_ToolKit.pdf?VersionId=785wGqP.xIAVryt79tl2LBa7STlXnV6A

https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf

http://visual.ons.gov.uk/trading-places-uk-goods-trade-with-eu-partners/