https://www.gov.uk/government/news/pms-european-council-press-statement-20-october-2017
https://ukandeu.ac.uk/post-global-britain-a-new-normal-in-uk-foreign-policy/?mc_cid=a36ff76330&mc_eid=815b1928ec
https://publications.parliament.uk/pa/cm201719/cmselect/cmhaff/421/421.pdf
http://www.oliverwyman.com/content/dam/oliver-wyman/v2/publications/2018/march/Oliver-Wyman_Clifford-Chance-The-Red-Tape-Cost-of-Brexit.pdf