https://www.publications.parliament.uk/pa/cm201617/cmselect/cmintrade/817/817.pdf
http://europa.eu/rapid/press-release_IP-18-463_en.htm
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmbeis/909/909.pdf
https://blogs.sussex.ac.uk/uktpo/2018/12/17/organising-the-second-referendum/