https://wiiw.ac.at/the-granular-trade-and-production-activities-grantpa-database-dlp-6911.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/680366/Technical_Note_-_International_Agreements_in_the_Implementation_Period_-_CLEAN.pdf
https://www.brookings.edu/articles/what-are-tariffs-and-why-are-they-rising/
http://visual.ons.gov.uk/trading-places-uk-goods-trade-with-eu-partners/