10(1)A section 91 order may provide for new section 66E (rules about charges that may be imposed under a section 66D agreement) to have effect as regards—U.K.
(a)charges payable under old section 66D agreements, or
(b)specified descriptions of charges payable under old section 66D agreements.
(2)Provision under sub-paragraph (1) may include provision for making such modifications of—
(a)new sections 66E to 66ED, and
(b)old sections 66A to 66D and 66F,
as appear to the Secretary of State to be appropriate.
(3)Provision under sub-paragraph (1) may provide for the modification of old section 66D agreements and may in particular include provision for the Water Services Regulation Authority to vary the agreement by order, on application by a party to the agreement.
(4)Before making provision under this paragraph in relation to the supply of water using the supply system of a water undertaker whose area is wholly or mainly in Wales, the Secretary of State must consult the Welsh Ministers.