12Section 15 of the principal Act shall have effect where—
(a)after the making of a hire-purchase agreement, the owner, as seller, makes a conditional sale agreement with the hirer, as buyer, or
(b)after the making of a conditional sale agreement, the seller, as owner, makes a hire-purchase agreement with the buyer, as hirer,
as it has effect where both agreements are hire-purchase agreements or both are conditional sale agreements.