In the case of transactions within the scope of Article 1, traders shall be required to give consumers written notice of their right of cancellation within the period laid down in Article 5, together with the name and address of a person against whom that right may be exercised.
Such notice shall be dated and shall state particulars enabling the contract to be identified. It shall be given to the consumer:
(a) in the case of Article 1(1), at the time of conclusion of the contract;
(b) in the case of Article 1(2), not later than the time of conclusion of the contract;
(c) in the case of Article 1(3) and 1(4), when the offer is made by the consumer.
Member States shall ensure that their national legislation lays down appropriate consumer protection measures in cases where the information referred to in this Article is not supplied.