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 Act 1966
The Ministry of Social Security Act 1966 was a piece of legislation passed by the United Kingdom Parliament to establish the Supplementary Benefits Scheme whereby the National Assistance Board was transformed into the Supplementary Benefit Board. By merging this with the Ministry of Pensions and National Assistance, the new Ministry of Social Security was created. The Act received Royal Assent on 3 August 1966.