https://cy.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationprojections/methodologies/subnationalpopulationprojectionsaccuracyreport
Subnational Population Projections Accuracy Report - Office for National Statistics
This report assesses the accuracy of the Subnational Population Projections (SNPPs) that are produced by the Office for National Statistics (ONS) for local...
population projectionsaccuracy reportsubnationalofficestatistics