
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/710147/DATA_-_FINAL.pdf

http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf

https://capx.co/the-rosbif-in-chief-why-the-french-love-boris-johnson/?utm_source=Sailthru&utm_medium=email&utm_campaign=WaughZone%20June%203&utm_term=uk-politics