61As from the appointed day, references in subsections (1) and (4) of section 5 of the [1958 c. 23.] Milford Haven Conservancy Act 1958 (powers with respect to dredging, &c.) to a submarine cable placed or maintained by the Postmaster General shall be construed as including references to such a cable placed or maintained by the authority, and the second reference in the said subsection (4) to the Postmaster General shall be construed as referring to the authority.