National Insurance number
The National Insurance number is used as a reference number in the Pay As You Earn system, and also by the self-employed. It is also used in applications for Individual Savings Accounts (ISAs), to check that an individual has opened only one ISA in a tax year.
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).