https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/9/9.pdf
http://www.europarl.europa.eu/RegData/etudes/IDAN/2017/599352/EPRS_IDA%282017%29599352_EN.pdf
http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
http://www.coggs.polis.cam.ac.uk/news/forum-on-geopolitics-triple-bill-on-brexit