Migration component of change from ONS population estimates. Estimates for year ending June 30.
Estimates for mid-2012 to mid-2016 have been revised. Methodological improvements have been implemented allowing the creation of a new series of population estimates that roll forward the 2011 Census. These revised figures include new estimates of local authority international emigration and foreign armed forces dependants.
An international long-term migrant is defined as a person who moves to a country other than that of his or her usual residence for a period of at least a year, so that the country of destination effectively becomes his or her new country of usual residence.
Inflow: Persons arriving or returning from abroad to take up residence in a country for a period of at least 12 months.
Outflow: Persons leaving their country of usual residence to take up residence in another country for a period of at least 12 months.
At the national level, this component estimates migration between England & Wales and the rest of the UK (cross-border flows). At sub-national level estimates of flows between each local authority and other local authorities in England & Wales are also included. Since internal moves are not recorded formally, information obtained from the NHS Central Register (NHSCR) and GP Patient Registers are used as a proxy. These data are considered to be a good proxy for internal migration as, when moving, most patients will eventually register with a new GP. Complete information on all moves at former Health Authority Level from the NHSCR are combined with more geographically detailed data from the patient registers to produce the migration estimates by local authority used in the population estimates.
Estimates for years prior to mid-2011 are the latest figures, which have been revised in light of the 2011 Census.
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