The following section shall be inserted after section 3 of the 1968 Act—
(1)Without prejudice to their powers under section 3 of this Act (including any power to authorise the construction, on their behalf, of a public sewer), a sewerage authority may authorise a person to construct, within their area but whether or not connecting with their sewers or sewage treatment works, a sewer—
(a)in, under or over any road, or under any cellar or vault below any road; or
(b)in, on or over any land which does not form part of a road and is not land as respects which he is owner, lessee or occupier,
but where authorisation is so given, subsection (2) of section 3 of this Act shall apply in respect of the person and the construction proposed as that subsection applies in respect of a sewerage authority and works proposed by them under subsection (1) of that section.
(2)The sewerage authority—
(a)in giving authorisation to a person under subsection (1) above; or
(b)as respects any sewer (not being a sewer constructed by or on behalf of the authority) whose construction by a person does not require such authorisation,
may, in a case where the proposed sewer will connect with their sewers or sewage treatment works, determine (and by written notice advise the person) that all, or a part which they shall specify in the notice, of the sewer constructed shall not vest in them through the operation of section 16(1)(c) of this Act and shall instead vest in him; but notwithstanding the determination the sewerage authority may, on such terms and conditions as they think fit, then or at some later time enter into an agreement under which the sewer, or as the case may be the part, shall vest in them.”.