The National Digital Archive of Datasets (NDAD) provides access to archived datasets and documents from United Kingdom government departments which can be searched or browsed by subjects such as armed forces service or wills and death duties. Statistics and information gathered through census data as well as public records are used to compile the available datasets. All datasets are available to download and contain a record summary as well as custodial history, background on the source of the data and whether or not data may be added to the dataset in the future.
The NDAD system was discontinued in 2010 because the way government works with datasets has greatly evolved since 1997. More information is available at http://webarchive.nationalarchives.gov.uk/20101104101827/http://www.ndad.nationalarchives.gov.uk/