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".
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.