https://www.ft.com/content/b638551a-68c3-11e7-8526-7b38dcaef614
http://cer.eu/in-the-press/speech-michel-barnier-future-eu-conference
https://rusi.org/sites/default/files/briefingpaper-france-uk-2017.pdf
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmbeis/909/909.pdf