Principal Act means the Local Government Act 1974.
Principal Act: a reference to the Municipal Corporations Act 1954 was substituted, as from 1 April 1955, for a reference to the Municipal Corporations Act 1933 pursuant to section 413 Municipal Corporations Act 1954 (1954 No 76).
That reference was in turn substituted, as from 1 April 1980, by a reference to the Local Government Act 1974 pursuant to section 9(1) Local Government Amendment Act 1979 (1979 No 59).