166.NRSWA provides that an undertaker who carries out street works must pay a street authority a fee in respect of certain inspections of the works. It also provides for a street authority to carry out such investigatory works as appear to them to be necessary to ascertain whether the undertaker has complied with his duties with respect to reinstatement. Section 59 inserts a new section 73F into NRSWA. Section 73F (guidance about street authority inspections) provides for the Secretary of State to issue or approve guidance to street authorities exercising their powers to inspect works. Section 73F(2) provides that an authority must have regard to the guidance in carrying out any such inspections. Section 73F(3) clarifies that guidance on the carrying out of investigatory works may be provided under the umbrella of guidance on inspections generally.