https://policyexchange.org.uk/wp-content/uploads/2017/07/Farming_Tomorrow.pdf
https://ec.europa.eu/commission/presscorner/api/files/attachment/867751/NA0620220ENN_002.pdf
http://www.res.org.uk/view/art4Apr17Features.html
https://www.theguardian.com/politics/2017/nov/10/brexit-date-is-not-irreversible-says-man-who-wrote-article-50-lord-kerr