A relevant authority may, in accordance with any arrangements which it has entered into for the purpose with any sewerage undertaker, carry out sewerage functions on that undertaker's behalf in relation to such area comprising the whole or any part of that authority's relevant area, together (where that authority are a local authority or an urban development corporation and the arrangements so provide) with parts of any adjacent relevant areas of other relevant authorities, as may be specified in the arrangements.
Arrangements entered into for the purposes of this section may contain any such provision as may be agreed between the relevant authority and the sewerage undertaker but shall not affect the availability to any person, other than the relevant authority, of any remedy against the undertaker in respect of the carrying out of the undertaker's sewerage functions or of any failure to carry them out.
It is hereby declared that, if arrangements entered into for the purposes of this section so provide, a relevant authority shall be entitled to exercise on behalf of a sewerage undertaker any power which by or under any enactment is exercisable by the undertaker for the purposes of, or in connection with, the carrying out of the undertaker's sewerage functions.
Where arrangements entered into for the purposes of this section provide for a local authority to carry out the sewerage functions of a sewerage undertaker on the undertaker's behalf, section 101 of the Local Government Act 1972 (delegation of functions), so far as it relates to the carrying out of functions by a committee, sub-committee or officer of a local authority, shall have effect in relation to those sewerage functions only in so far as the arrangements do not otherwise provide.
Where arrangements entered into for the purposes of this section provide for a local authority which are operating executive arrangements to carry out the sewerage functions of a sewerage undertaker on that undertaker's behalf—
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