11.—(1) Contravention of regulation 4, 5, 6, 7, 8 or 9 by an employer shall be an offence punishable on summary conviction by a fine not exceeding £2,000 or on conviction on indictment by imprisonment for a term not exceeding two years or a fine, or both.
(2) Contravention of regulation 4, 7, 8 or 9 by a master shall be an offence punishable only on summary conviction by a fine not exceeding £1,000.
(3) Contravention of regulation 10 shall be an offence punishable only on summary conviction by a fine not exceeding £400.
(4) It shall be a defence for a person charged in respect of a contravention of regulation 4(1) or (2) or 9(2) to show that the requirements of the relevant regulation were complied with so far as was reasonably practicable.
(5) It shall be a defence for a person charged under these Regulations, including a person charged by virtue of regulation 12, to show that he took all reasonable precautions and exercised all due diligence to avoid the commission of the offence.