https://www.gov.uk/government/news/pms-european-council-press-statement-20-october-2017
https://www.instituteforgovernment.org.uk/sites/default/files/publications/5704%20IFG%20-%20Frictionless%20Trade%20Web.pdf
https://www.fragomen.com/file/scottishfuturespdf
https://www.socialeurope.eu/brexit-can-be-stopped-but-the-window-of-opportunity-is-closing-fast