https://www.fragomen.com/file/scottishfuturespdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/articles/overviewoftheukpopulation/mar2017
https://ec.europa.eu/commission/publications/terms-reference-article-50-treaty-european-union-negotiations_en