
http://openeurope.org.uk/today/blog/will-brexit-ground-flights-europe/

https://brc.org.uk/media/674001/a-fair-deal-for-consumers-february-2020.pdf

http://blogs.lse.ac.uk/brexit/2018/05/15/switzerland-wanted-more-immigration-controls-but-economic-self-interest-will-probably-prevail/