https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
https://www.sussex.ac.uk/webteam/gateway/file.php?name=briefing-paper-1.pdf&site=18
https://ukandeu.ac.uk/wp-content/uploads/2022/09/UKICE-Levelling-Up-Report.pdf
http://europa.eu/rapid/press-release_IP-18-463_en.htm