Only age and sex of attributes for individuals

• Only age and sex of attributes for individuals

• The propensity to register with a new doctor will vary between different migrant subgroups, e.g. young males and pregnant women

• They only provide data on flows between relatively coarse spatial units (FHSAs/HAs)

• Some short-distance moves missed

• Individual members of armed forces are only recorded as entries to and exits from the services - only the origin of recruits and the destination of those discharged are recorded

• Long-stay psychiatric patients and prisoners are excluded altogether

Notes:

Some individuals, notably young adult males, may not register with a doctor until they need to, which may be several months after they have moved, whilst others such as the elderly or pregnant women are likely to register immediately if not before they have made a move

Output data from the population census can be obtained at ward and enumeration district level

Some short distance moves that happen to cross an FHSA boundary will not be recorded because the individuals may not bother to register with a new doctor;