The Secretary of State may make regulations prescribing the manner in which the audit of the accounts of a local authority shall be conducted by the auditor and the matters with respect to the accounts, the accounting arrangements of the authority and the repayment of moneys borrowed by the authority upon which the auditor shall report, and any such regulations may, in the case of a particular local authority or class of local authority where it appears to the Secretary of State expedient so to do, vary the procedure and the times and periods specified in this Part of this Act.