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 Contributions and Benefits Act 1992
The Social Security Contributions and Benefits Act 1992 (c 4) is the primary legislation concerning the state retirement provision, accident insurance, statutory sick pay and maternity pay in the United Kingdom.