https://www.socialeurope.eu/2017/07/road-soft-brexit/
http://www.res.org.uk/view/art4Apr17Features.html
https://www.rand.org/pubs/research_reports/RR2200.html
http://blogs.lse.ac.uk/brexit/2017/09/05/warning-the-cost-of-brexit-could-seriously-damage-your-health-service/