(1)A person’s unrelieved qualifying expenditure for the chargeable period in which the qualifying expenditure is incurred is the whole of it.
(2)A person’s unrelieved qualifying expenditure for a chargeable period after that in which the qualifying expenditure is incurred is the amount, if any, by which it exceeds the aggregate of—
(a)the allowances made in respect of the expenditure for earlier chargeable periods, and
(b)the total of any disposal receipts for earlier chargeable periods.