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.
Social Security Appeal Tribunal
The Social Security Appeal Tribunal was a tribunal in the United Kingdom which heard appeals from decisions made by the Department for Work and Pensions, HM Revenue and Customs and local authorities regarding entitlement to various forms of social security benefits.