(3) For the purposes of these Regulations, a notice of cancellation is a notice in writing or in another durable medium available and accessible to the supplier (or to the other person to whom it is given) which, however expressed, indicates the intention of the consumer to cancel the contract.
(4) A notice of cancellation given under this regulation by a consumer to a supplier or other person is to be treated as having been properly given if the consumer -
(a)leaves it at the address last known to the consumer and addressed to the supplier or other person by name (in which case it is to be taken to have been given on the day on which it was left);
(b)sends it by post to the address last known to the consumer and addressed to the supplier or other person by name (in which case, it is to be taken to have been given on the day on which it was posted);
(c)sends it by facsimile to the business facsimile number last known to the consumer (in which case it is to be taken to have been given on the day on which it is sent); or
(d)sends it by electronic mail, to the business electronic mail address last known to the consumer (in which case it is to be taken to have been given on the day on which it is sent).