13.—(1) Where the claimant or his partner is treated as responsible for a child or young person by virtue of regulation 9 (circumstances in which a person is to be treated as responsible or not responsible for another), £15 of any payment of maintenance, whether under a court order or not, which is made or due to be made by—
(a)the claimant’s former partner, or the claimant’s partner’s former partner; or
(b)the parent of a child or young person where that child or young person is a member of the claimant’s family except where that parent is the claimant or the claimant’s partner.
(2) For the purposes of sub-paragraph (1), where more than one maintenance payment falls to be taken into account in any week, all such payments shall be aggregated and treated as if they were a single payment.