For the purposes of F.2,—

• “previously replaced” means replaced without compliance with that condition within the 6 month period prior to undertaking the development in question; and

• the “principal elevation” is (i) the wall of the principal elevation in its original form; or (ii) that wall as it would exist if its original form were to have been extended, continuing the line of the wall, from each of its side edges to the boundary of the present curtilage of the dwellinghouse.