http://www.europarl.europa.eu/cmsdata/115748/IPOL_IDA(2017)583130_EN.pdf
https://infacts.org/brexit-britain-long-way-fall-touches-bottom/
http://fedtrust.co.uk/brexitthe-conservative-centre-cannot-hold/
https://www.instituteforgovernment.org.uk/sites/default/files/publications/5704%20IFG%20-%20Frictionless%20Trade%20Web.pdf