3. Where a person is, under a charges scheme, liable to pay an amount–
(a)in respect of the provision of water supply services or sewerage services or both by Scottish Water to a dwelling in the relevant year, and
(b)the amount is payable to a local authority by virtue of the Water Services Charges (Billing and Collection) (Scotland) Order 2002(1),
the amount payable in respect of the relevant year shall be less than it would be but for these regulations and shall be reduced by the amount calculated in accordance with regulation 4 below.
S.S.I. 2002/33, amended by S.S.I. 2002/166 (article 6).