6. Paragraph 6 of Schedule 6 to the 1997 Act shall have effect as if, in section 146A(1AA) of the Local Government Act 1972 (application to police authorities of miscellaneous powers of local authorities), as inserted by sub-paragraph (4) of that paragraph, for the words from “shall” to the end there were substituted the words “shall be treated as a principal council for the purposes of section 120 above only and as local authority for the purposes of section 135 above only”.