54. A reduction period determined in relation to a sanctionable failure takes effect from—
(a)where the claimant has not been paid an employment and support allowance for the benefit week in which the Department determines that the amount of the award of the employment and support allowance is to be reduced under section 11J of the Act, the first day of that benefit week;
(b)where the claimant has been paid an employment and support allowance for the benefit week referred to in paragraph (a), the first day of the first benefit week for which the claimant has not been paid an employment and support allowance; or
(c)where the amount of the award of the employment and support allowance for the benefit week referred to in paragraph (a) or (b) is already subject to a reduction because of a previous sanctionable failure, the first day in respect of which the amount of the award is no longer subject to that reduction.