This section enables the Department to obtain an explanation if it thinks a public authority has failed to exercise its functions to further (or, where permissible, least hinder) the conservation objectives, or failed to act in accordance with the advice or guidance provided by the Department. This section has effect even when the public authority did not initially request the advice or guidance. The public authority must provide an explanation in writing within 28 days of the Department’s request (or longer with the Department’s agreement).