8.—(1) Where an owner-occupier meets the payment condition, liability condition and occupation condition in respect of one or more relevant payments and the qualifying period has ended, each of the relevant payments is to be taken into account for the purposes of the calculation under this Part.
(2) No account is to be taken of any amount of a relevant payment to the extent that the conditions referred to in sub-paragraph (1) are not met in respect of that amount.
(3) Any particular payment for which an owner-occupier is liable is not to be brought into account more than once, whether in relation to the same or a different owner-occupier (but this does not prevent different payments of the same description being brought into account in respect of an assessment period).