You asked

Please provide a table with the Postcode District (e.g. SA1, LL15 etc) in the first field, and the number of speakers of Welsh, Gaelic, Irish and Cornish as recorded in the 2011 Census in the second to fifth fields respectively. I define ‘speaker’ here as someone who reports that they can speak the language.

We said

You have made a Freedom of Information Request for information about the number of speakers of Welsh and other Celtic languages at postcode district level in the United Kingdom.

The Office for National Statistics publishes information from the 2011 Census for England and Wales on main language spoken for all usual residents aged 3 and over. Relevant statistics are available on the Nomis website. Table QS204EW - Main language (detailed) provides information for Welsh, Cornish and a variety of Gaelic languages and may be accessed from the attached link:

https://www.nomisweb.co.uk/census/2011/qs204ew

You should use the ‘Query data’ button in the ‘Explore in detail’ section to enter the geography (postcode districts or sectors) and languages you require.

Please note that the information relates to the person’s first or preferred language. In accordance with standard practice to protect against the disclosure of personal information some records have been swapped between different geographic areas. As a result some counts will be affected, particularly small counts at the lowest geographies.

We are not able to provide information for the United Kingdom as we are only responsible for the census in England and Wales. Please contact National Records of Scotland http://nationalrecordsofscotland.gov.uk/statistics-and-data/census and the Northern Ireland Statistics and Research Agency http://www.nisra.gov.uk/Census.html for advice on the availability of information.

If you have similar queries in the future you may find it easier to contact Census Customer Services. They may be contacted at:

Web: https://www.ons.gov.uk/census/censuscustomerservices
Email: census.customerservices@ons.gsi.gov.uk
Telephone: 01329 444972
In writing: Census Customer Services, Office for National Statistics, Segensworth Road, Titchfield, Fareham, Hampshire PO15 5RR