https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/365.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_customs_WEB.pdf
https://ukandeu.ac.uk/the-uk-internal-market-bill-breaking-law-and-reputation/?mc_cid=7627d659c2&mc_eid=815b1928ec
https://fabiusmaximus.com/2016/10/16/stratfor-eu-budget-battles-after-brexit/