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2001 SMS
Data are released at different ‘Levels’
2001 SMS Level 1
- Migration within and between 426 Local Authorities
2001 SMS Level 2
- Migration within and between 10,000+ wards
2001 SMS Level 3
- Migration within and between 223,000+ Output Areas
As the spatial detail increases, the attribute detail is reduced
Scope of the data is United Kingdom
- Some variations in detail in different countries