10. The total rent allowance expenditure in the relevant year attributable to each of—
(a)that part of any weekly eligible rents which exceeds any relevant threshold specified in a Subsidy Order for the purpose of calculating subsidy on such rents;
(b)that part of any weekly eligible rents which were at or below any such threshold; and
(c)that part of any weekly eligible rents to which any such threshold did not apply excluding cases which have been referred to a rent officer for a determination under section 121 of the Housing Act 1988(1).