84A.—(1) Any person duly authorised in writing by the Department may at any reasonable time enter any land—
(a)to ascertain whether there is or has been any breach of planning control on the land or any other land;
(b)to ascertain whether an offence has been, or is being, committed with respect to any building on the land or any other land, under Article 44, 49 or 72 (as applied by Article 77(6));
(c)to ascertain whether an offence has been committed under Article 61, 66 or 66A;
(d)for the purpose of exercising any of the functions conferred by Article 80;
(e)to determine whether any of the powers conferred on the Department by this Part should be exercised in relation to the land or any other land;
(f)to determine how any such power should be exercised in relation to the land or any other land;
(g)to ascertain whether there has been compliance with any requirement imposed as a result of any such power having been exercised in relation to the land or any other land,
if there are reasonable grounds for entering for the purpose in question.
(2) Admission to any building used as a dwelling-house shall not be demanded as of right by virtue of paragraph (1) unless 24 hours' notice of the intended entry has been given to the occupier of the building.]