The 1981 Census was undertaken on the night of Sunday 5 April 1981.
The Census was carried out by the Office of Population and Censuses and Surveys (OPCS) in England and Wales, the General Registrars Office for Scotland (GROS) in Scotland and the Department of Health and Social Security in Northern Ireland.
The Census questionnaire, table layouts and definitions volume can be downloaded as PDF files below:
1981 Census Private Households Census Questionnaire (PDF) for England
1981 Census Small Area Statistics Census table layouts (PDF)
1981 Census Special Workplace Statistics Statistics Census table layouts (PDF)
1981 Census definitions and concept (PDF) for Great Britain.