Which of the following is NOT a responsibility of unitary authorities?

Unitary authorities are responsible for a wide range of local government functions, usually combining the roles of both county and district councils. Their responsibilities typically include areas such as environmental health, development control, and licensing, all of which fall under their jurisdiction to manage public services effectively for their communities.

Public transportation, however, often involves a more complex arrangement that can include not just local authorities, but also regional transportation agencies and other stakeholders that manage transport networks and services. While unitary authorities may have some input or responsibilities in relation to public transport—such as planning or providing certain local services—the overall organization and major service provision often extend beyond their direct control. Therefore, public transportation is not exclusively a responsibility of unitary authorities, which makes it the correct answer as the one that does not align with their defined duties.