https://ec.europa.eu/commission/sites/beta-political/files/position-paper-public-procurement_en.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmbeis/380/380.pdf
http://www.lawsociety.org.uk/news/stories/leaving-in-an-orderly-fashion-our-approach-to-brexit/
https://voxeu.org/system/files/epublication/Economics%20of%20Brexit.pdf