(1)A person commits an offence if he interferes with—
(a)works executed in connection with the exercise of powers conferred by virtue of section 29 or 30, or
(b)any apparatus, equipment or other thing used in connection with the exercise of those powers.
(2)It is a defence for a person charged with an offence under this section to prove that he had a reasonable excuse for his interference.
(3)A person guilty of an offence under this section shall be liable on summary conviction to—
(a)imprisonment for a term not exceeding six months,
(b)a fine not exceeding level 5 on the standard scale, or
(c)both.
(4)An authorisation to exercise powers under section 29 or 30 may authorise—
(a)the exercise of all those powers, or
(b)the exercise of a specified power or class of powers.
(5)An authorisation to exercise powers under section 29 or 30 may be addressed—
(a)to specified persons, or
(b)to persons of a specified class.