73.—(1) Where in the case of recoverable excess benefit, in consequence of a misrepresentation or failure to disclose a material fact (in either case whether fraudulent or otherwise) as to a person’s capital, or an error, other than one to which regulation 68(2) (effect of official error) refers, as to the amount of a person’s capital, the excess benefit was in respect of a period (“the excess benefit period”) of more than 13 benefit weeks, the relevant authority shall, for the purpose only of calculating the amount of excess—
(a)at the end of the first 13 benefit weeks of the excess benefit period, treat the amount of the capital as having been reduced by the amount of excess council tax benefit allowed during those 13 weeks;
(b)at the end of each subsequent period of 13 benefit weeks, if any, of the excess benefit period, treat the amount of that capital as having been further reduced by the amount of excess council tax benefit allowed during the immediately preceding 13 benefit weeks.
(2) Capital shall not be treated as reduced over any period other than 13 benefit weeks or in any circumstances other than those, for which paragraph (1) provides.