https://policyexchange.org.uk/wp-content/uploads/2017/06/Defying-Gravity-A-critique-of-estimates-of-the-economic-impact-of-Brexit.pdf
https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf
https://brc.org.uk/media/674001/a-fair-deal-for-consumers-february-2020.pdf