A standard clustering methodology similar to the one suggested by Milligan (1996) was used to create the classification:

• A standard clustering methodology similar to the one suggested by Milligan (1996) was used to create the classification:

• 408 Local authority districts in Britain were chosen as objects to cluster

• 56 variables were selected from an original list of 5559 taken from 7 2001 Census SMS level 1 tables. Domains included:

• In/out/within/international/no usual address migration rates for age, ethnicity, economic activity and long term illness
• Migration efficiency rates (due to no suitable denominator) for Socio-economic status, family status and housing tenure

• Selection through a combination of correlation analysis, principal components analysis and analysis of standard deviation stats.