
https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/articles/overviewoftheukpopulation/mar2017

https://www.etui.org/sites/default/files/2023-12/Relocation-an%20old%20problem%20in%20search%20of%20new%20answers_2023%20%281%29.pdf

https://www.wilsoncenter.org/sites/default/files/media/uploads/documents/RAFDI_Working_Group_Report_0.pdf