http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/
https://www.thetimes.co.uk/edition/news/irish-want-sea-border-with-uk-after-brexit-lvb6n35fq
https://committees.parliament.uk/publications/8781/documents/88926/default/
https://visual.ons.gov.uk/commonwealth-trade-in-focus-as-uk-prepares-for-brexit/