http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/
https://www.hks.harvard.edu/sites/default/files/centers/mrcbg/working.papers/84_Harvard%20Working%20PaperTime%20for%20ClarityFinPAS.pdf
https://ukandeu.ac.uk/wp-content/uploads/2019/12/Brexit-the-manifestos-uncovered.pdf
https://www.esri.ie/system/files/publications/RB202017_2.pdf