https://www.gov.uk/government/news/joint-article-a-deep-and-special-partnership
https://ukandeu.ac.uk/wp-content/uploads/2021/06/EU-UK-2030-Report.pdf
http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
http://europa.eu/rapid/press-release_MEMO-17-2001_en.htm