Ascertainment of entitlement to discount
14. Before making any calculation for the purposes of Part V of these Regulations of the chargeable amount in respect of any dwelling in its area, a billing authority shall take reasonable steps to ascertain whether that amount is subject to any discount under section 11 of the Act or, in the case of a chargeable dwelling in Wales, that section or section 12 of the Act, and if so, the amount of that discount.