(1) Subject to subsection (2), a person, in the performance of his or her functions under this Act, may, for the purpose of surveying and carrying out a valuation of any relevant property, at any reasonable time -

(a) enter on that property, and

(b) if it is necessary in order to so enter on that property or to survey or carry out a valuation thereof, enter on any other property,

and may survey and carry out a valuation of the first-mentioned property accordingly.

(2) A person shall not, without the consent of the occupier of the property, exercise the powers under subsection (1) in relation to a property referred to in paragraph (a) or (b) of that subsection unless, at least 3 days before the date on which he or she intends to so exercise those powers, he or she serves on the occupier of the property a notice of that intention.

(3) A person who obstructs or impedes a person in the exercise of any of his or her powers under this section shall be guilty of an offence.