This dataset provides 2011 estimates that classify usual residents in England and Wales by their age of arrival in the UK. The estimates are as at census day, 27 March 2011.

This is the first time this information has been available from the census and is used to build a picture of length of residency in the UK by migrants. The data are used for estimating future migration trends, which helps assess the implications on the need for services, jobs and training. These statistics are also used to identify the changing needs of past and present migrants living in the local community.

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.