https://ec.europa.eu/commission/sites/beta-political/files/position-paper-public-procurement_en.pdf
https://www.sbs.strath.ac.uk/economics/fraser/20171129/GMB-Brexit-report.pdf
https://www.gov.uk/government/news/joint-article-a-deep-and-special-partnership
http://www.parliament.uk/documents/commons-committees/Exiting-the-European-Union/17-19/Cross-Whitehall-briefing/EU-Exit-Analysis-Cross-Whitehall-Briefing.pdf