https://www.theguardian.com/politics/2017/sep/04/uk-trade-deals-after-brexit-theresa-may-eu
http://www.lawsociety.org.uk/news/stories/leaving-in-an-orderly-fashion-our-approach-to-brexit/
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/fomeef18008en.pdf
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmintrade/817/817.pdf