4.—(1) Where a package travel contract is sold through a retailer—
(a)the organiser and the retailer must ensure that the duties imposed by regulations 5, 6 and 7 (“the information duties”) are performed;
(b)the organiser and the retailer may agree whether the information duties are to be performed by the organiser or the retailer; and
(c)either the organiser or the retailer must perform the information duties.
(2) Where a package travel contract is not sold through a retailer, the organiser must perform the information duties imposed by regulations 5, 6 and 7.
(3) In this Part, the person who, in accordance with this regulation, performs, or it is agreed is to perform, a duty imposed by a provision of regulation 5, 6 or 7, is “the relevant person” for the purposes of the provision of regulation 5, 6 or 7 under which the duty is performed or it is agreed is to be performed.