The lead enforcement authority may—
If the lead enforcement authority proposes to take steps in respect of a breach (or suspected breach) of a leasehold house restriction, it must notify the enforcement authority for the area in which the breach occurred (or may have occurred) that it proposes to do so.
If the lead enforcement authority notifies an enforcement authority under subsection (2) but does not take the proposed steps, the lead enforcement authority must notify the enforcement authority of that fact.
If an enforcement authority receives a notification under subsection (2), the authority is relieved of its duty under section 17(1) in relation to the breach unless the authority receives a notification under subsection (3).
But the lead enforcement authority may require the enforcement authority to assist the lead enforcement authority in taking steps to enforce the leasehold house restriction referred to in subsection (2).