https://www.nao.org.uk/wp-content/uploads/2018/10/The-UK-border-preparedness-for-EU-exit.pdf
https://ec.europa.eu/commission/sites/beta-political/files/position-paper-public-procurement_en.pdf
https://www.fragomen.com/file/scottishfuturespdf
https://www.ifs.org.uk/publications/10302