(4) Without prejudice to subsection (5), where a water services authority is also the relevant planning authority, the grant of a permission under Part III of the Act of 2000 in relation to a structure to which this section applies may, if it is indicated in the permission, include the agreement of the water services authority to the connection of that structure to its waterworks for the purposes of this section, subject to such conditions as the water services authority may require, consistent with its functions under this section.