http://ukandeu.ac.uk/an-utterly-pernicious-bill/
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_customs_WEB.pdf
http://voxeu.org/system/files/epublication/Brexit_Beckons_VoxEU.pdf
https://www.theatlantic.com/international/archive/2020/09/britain-brexit-humbling/616343/