§ Mr. Freeman
Estimates of population for local and health authorities in England have been extrapolated forward from 1988 to 1989 and 1990. It has been assumed that recent average changes in each area arising from births, deaths, and migration will be maintained, subject to constraints set by the latest (1988-based) national population projections for England made by the Government Actuary's department. Past estimates of migration have been derived from re-registrations on the National Health Service central register as people move from a doctor's list in one family practitioner committee area to a list in another such area (migration within the United Kingdom), and from results of the international passenger survey (international migration). The net inwards migration levels assumed for 1988–89 and 1989–90 on this basis are less than the levels estimated for each of the previous four years.