Analysis of information sources in references of the Wikipedia article "Unitary authority" in English language version.
The term 'unitary administration' is used in this context to describe all local authority districts (LAD) that form a single tier of local government (that is, all UK local authority districts except for English counties and non-metropolitan districts). The term therefore covers unitary authorities (UA), metropolitan districts and London boroughs in England; UAs in Wales; council areas in Scotland; and local government districts (LGDs) in Northern Ireland. Note though that the term is not in common use and that it is a generic term, rather than one that reflects a specific geographic type.