a local authority receives an application for its consent under this section, or within such longer period as the authority and the applicant agree in writing, the authority has not notified the applicant of its decision on the application, the authority shall be deemed to have refused consent in pursuance of the application. (4) An applicant for consent under this section may appeal to the Secretary of State against the local authority's decision on the application within the period of three months beginning with the date on which the authority notifies him of the decision or, in a case falling within the preceding subsection, beginning with the expiration of the period or longer period there mentioned; and it shall be the duty of the local authority to act in accordance with the decision of the Secretary of State on the appeal. (5) If noise emitted from any premises constitutes a contravention of subsection (1) of this section or of a condition attached to a consent under this section, the person responsible shall be guilty of an offence against this Part of this Act. (6) The magistrates' court convicting a person of an offence under the preceding subsection may, if satisfied that the offence is likely to continue or recur, make an order requiring the execution of any works necessary to prevent it continuing or recurring, and if that person without reasonable excuse contravenes any requirement of the order he shall be guilty of an offence against this Part of this