Any person authorised by the Secretary of State in that behalf shall have power at all reasonable times to enter on and inspect any land for the purpose of determining whether, and if so in what manner, any of the powers conferred on the Secretary of State by this Act are to be exercised in relation to the land, or whether, and if so in what manner, any direction given under any such power has been complied with.

Any person authorised by the Secretary of State who proposes to exercise any power of entry or inspection conferred by this Act shall, if so required, produce some duly authenticated document showing his authority to exercise the power.

Admission to any land used for residential purposes shall not be demanded as of right in the exercise of any such power unless 24 hours notice of the intended entry has been given to the occupier of the land.

Save as provided by subsection (3) above, admission to any land shall not be demanded as of right in the exercise of any such power unless notice has been given to the occupier of the land that it is proposed to enter during a period, specified in the notice, not exceeding 14 days and beginning at least 24 hours after the giving of the notice and the entry is made on the land during the period specified in the notice.

Any person who obstructs a person authorised by the Secretary of State exercising any such power shall be guilty of an offence and shall be liable on summary conviction to a fine not exceeding level 2 on the standard scale.