Local Government Act (Northern Ireland) 1972

The Local Government (Northern Ireland) Act 1972 (c. 9 (N.I.)) was an act of the Parliament of Northern Ireland that constituted district councils to administer the twenty-six local government districts created by the Local Government (Boundaries) Act (Northern Ireland) 1971, and abolished the existing local authorities in Northern Ireland.

Source: Wikipedia — Local Government Act (Northern Ireland) 1972 (CC BY-SA 4.0)