# Valuation and Rating (Scotland) Act 1956, Paragraph 5


(1) Each Gas Board’s rateable valuation for any year shall be apportioned in respect of that year among all separately rated areas in which any therms were supplied by the Board to consumers, or manufactured by the Board, during the twelve months ending with the thirty–first day of March falling within the immediately preceding year, and the proportion of the rateable valuation to be allocated to any one of those areas shall be ascertained by multiplying the rateable valuation by the fraction of which—
(a) the numerator is the number of therms supplied by the Board to consumers in that area during the said twelve months, as estimated and certified by the Board, plus nine–tenths of the number of therms (if any) manufactured in that area by the Board during the said twelve months, as so estimated and certified, and
(b) the denominator is the total number of therms supplied by the Board to consumers in Scotlandduring the said twelve months, as estimated and certified by the Board, plus nine–tenths of the total number of therms manufactured by the Board during the said twelve months, as so estimated and certified.
(2) For the purpose of the apportionment in respect of any year of a Gas Board’s rateable valuation for that year among separately rated areas, all such areas which are in existence at the commencement of the said year shall be deemed to have existed during the twelve months ending with the thirty–first day of March falling within the immediately preceding year and to have had the same boundaries during the said twelve months as they have at the commencement of the first–mentioned year.

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Source: https://www.legislation.gov.uk/ukpga/Eliz2/4-5/60/schedule/FOURTH/paragraph/5 (the official version)
Page: https://openlegislation.uk/valuation-and-rating-scotland-act-1956/schedule-FOURTH/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.