Article 29 2

(a)

provisions whereby a consumer may take action under national law before the courts or before the competent administrative bodies to ensure that the national provisions transposing this Directive are complied with;

(b)

provisions whereby public bodies or private associations, organisations or other legal entities which have a legitimate interest, in ensuring that this Directive is complied with, may engage under national law before the courts or before the competent administrative bodies either on behalf or in support of the complainant, with his or her approval, in any judicial or administrative procedure provided for the enforcement of obligations under this Directive.