https://publications.parliament.uk/pa/ld201719/ldselect/ldconst/69/69.pdf
http://www.cer.eu/sites/default/files/pb_ireland_brexit_6.7.17.pdf
https://www.open-britain.co.uk/new_research_trade_deals_with_five_key_countries_could_take_26_years_to_negotiate
https://www.lrb.co.uk/v39/n18/swati-dhingra/how-not-to-do-trade-deals