For the purposes of an appeal under subsection (1)(a), it shall be assumed that the relevant authority has determined that the planning agreement shall continue to have effect without modification.

An appeal under this section shall be made by notice served within such period and in such manner as may be prescribed.

Subsections (7) to (10) of section 77 apply in relation to appeals to the planning appeals commission under this section as they apply in relation to applications to the relevant authority under that section.

Before determining the appeal the planning appeals commission must, if either the applicant or the relevant authority so wishes, afford to each of them an opportunity of appearing before and being heard by the planning appeals commission.

The determination of an appeal by the planning appeals commission under this section shall be final.