https://publications.parliament.uk/pa/cm201719/cmselect/cmintrade/520/520.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/514/514.pdf
https://theconversation.com/eu-citizens-proposal-a-lawyer-examines-the-detail-80111
http://www.euronews.com/2017/06/06/house-prices-signal-mixed-fortunes-for-europe