(1)Any person who contravenes any requirement imposed by an improvement notice shall be liable—
(a)on summary conviction, to a fine not exceeding the statutory maximum;
(b)on conviction on indictment, to a fine.
(2)Any person who contravenes any prohibition imposed by a prohibition notice shall be liable—
(a)on summary conviction, to a fine not exceeding the statutory maximum;
(b)on conviction on indictment, to imprisonment for a term not exceeding two years or a fine or both.
(3)It shall be a defence for a person charged with an offence under this section to prove that he exercised all due diligence to avoid a contravention of the requirement or prohibition in question.
(4)In this section any reference to an improvement notice or a prohibition notice includes a reference to any such notice as modified under section 264(3).