(58)This Directive should not regulate contract law issues related to the validity of credit agreements. Therefore, in that area, the Member States should be able to maintain or introduce national provisions which are in conformity with Union law. Member States should be able to regulate the legal regime governing the offer to conclude the credit agreement, in particular when the offer is to be given and the period during which such offer is to be binding on the creditor. If such an offer is made at the same time as the provision of the pre-contractual information provided for in this Directive, such offer should, like any additional information the creditor may wish to give to the consumer, be provided in a separate document. That separate document could be annexed to the Standard European Consumer Credit Information form.