National Insurance number
The National Insurance number is a number used in the United Kingdom in the administration of the National Insurance or social security system. It is also used for some purposes in the UK tax system. The number is described by the United Kingdom government as a "personal account number".
Ministry of Social Security (UK)
In November 1968, the Ministry of Health and the Ministry of Social Security were merged to create the new Department of Health and Social Security (DHSS).