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`(1) In Part II of Schedule 5 of the Abolition of Domestic Rates Etc. (Scotland) Act, 1987, the following paragraphs shall be inserted after paragraph 18:—
(18A) A local authority shall separately identify that amount of the community charge which is attributable to the provision of sewage services, which amount shall be the same proportion of the total community charge, as the amount referred to in paragraph 18 above is of the total estimated expenses mentioned in section 9(2) of the Act.
(18B) The liability for personal community charge of any person solely or mainly resident at premises whose drains or private sewers are not connected with public sewers or public sewerage treatment work shall be reduced by a sum equal to one half of the amount of community charge which is identifiable as being attributable to the provision of sewerage services in accordance with paragraph (18A) above.
(18C) Liability for payment of a standard or collective community charge in respect of premises whose drains or private sewers are not connected with public sewers or public sewerage treatment works shall be reduced by an amount equal to the product of—