https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/129/129.pdf
https://www.iod.com/Portals/0/PDFs/Campaigns%20and%20Reports/Europe%20and%20trade/Business-of-Brexit.pdf?ver=2017-05-22-090428-150
https://committees.parliament.uk/publications/30492/documents/175947/default/
https://www.friendsofeurope.org/sites/default/files/media-files/uk_report_web.pdf