https://publications.parliament.uk/pa/cm201719/cmselect/cmintrade/520/520.pdf
https://www.ippr.org/files/2017-09/cej-interim-report-summary-170911.pdf
http://bruegel.org/wp-content/uploads/2017/03/WP_2017_03-.pdf
https://ecipe.org/wp-content/uploads/2021/11/ECI_21_PolicyBrief_15_2021_LY01.pdf