The regulations may make provision relating to passenger tickets and baggage checks in respect of passengers or baggage in relation to whom or which this Part applies, being provision for:
(a) the circumstances in which such tickets and checks must be issued by carriers;
(b) matters to be included in such tickets and checks; and
(c) the non - application of a provision of section 31 (except in cases where the limit of liability under that provision is a sum specified in the contract of carriage) where specified provisions of the regulations relating to the issue, form and contents of such tickets or checks have not been complied with.