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 work
In the United Kingdom, just over half of social workers are employed by local authorities, and many of these are represented by UNISON, the public sector employee union. Smaller numbers are members of the Unite the Union and the GMB (trade union). The British Union of Social Work Employees (BUSWE) has been a section of the Community (trade union) since 2008.