This dataset provides 2011 Census estimates of the usual residents of the England and Wales aged 16 and over in employment the week before the census. The data classifies people currently resident in each output area, or higher area, and shows the movement between their area of residence and workplace output or higher area. The estimates are as at census day, 27 March 2011.

This dataset is very complex geographically and looking at flows between larger areas (local authorities, regions and countries) will be relatively very slow. It is one of two datasets which break down the data by census output areas but if all you are interested in is areas such as middle layer super output areas, local authorities and larger areas, it will be far simpler and quicker to use dataset WU01EW.

There is a further limitation in that the workplace data for countries only includes Scotland and Northern Ireland because the data is not broken down any further than this outside England and Wales.

In order to protect against disclosure of personal information from the 2011 Census, there has been swapping of records in the Census database between different geographic areas, and so some counts will be affected. In the main, the greatest effects will be at the lowest geographies, since the record swapping is targeted towards those households with unusual characteristics in small areas.

More details on the ONS Census disclosure control strategy may be found on the http://www.ons.gov.uk/ons/guide-method/census/2011/census-data/2011-census-prospectus/new-developments-for-2011-census-results/statistical-disclosure-control/index.html[Statistical Disclosure Control] page on the ONS web site.