This section applies where a sewerage licensee with a retail authorisation ("L") requests a sewerage undertaker to deal effectually with certain quantities of matter in its sewerage system in circumstances where—
sewerage services are to be provided in accordance with L's retail authorisation in respect of particular premises in the area of the undertaker, and
the quantities to be dealt with are to be determined by reference to the extent of sewerage services provided in respect of those premises.
Where this section applies, the sewerage undertaker must in accordance with a section 117E agreement—
take such steps in respect of the undertaker's sewerage system as may be provided for in that agreement in order to enable the use of that system for the purpose in subsection (1), and
having taken those steps, deal with matter as requested.
Where—
a request has been made by a sewerage licensee for the purposes of subsection (1), and
the steps which the undertaker is required to take by virtue of that request include steps for the purpose of obtaining any necessary authority for, or agreement to, any exercise by it of any of its powers or the carrying out by it of any works,
the failure of the undertaker to acquire the necessary authority or agreement does not affect the liability of the licensee to reimburse the undertaker in respect of some or all of the expenses incurred by it in taking those steps, if the section 117E agreement provides for such liability as regards those steps.