If any person—
he shall be guilty of an offence and liable, on summary conviction, to a fine not exceeding level 3 on the standard scale.
A person shall not be guilty of an offence under this section in respect of anything done by him with the appropriate consent .
In subsection (2) above, the "appropriate consent" means—
the consent of each of those persons.
In subsection (3) above, references to the consent of a relevant undertaker are references to consent under section 176 below.