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 (Scotland) Act 2018
The Social Security (Scotland) Act 2018 is an Act of the Scottish Parliament to allow for the devolution of aspects of the social security system to the Scottish Parliament as part of the devolution settlement agreed by the Smith Commission after the independence referendum in 2014.