Regulation 21 Calls for direct marketing purposes
(A1) A person shall neither use, nor instigate the use of, a public electronic communications service for the purposes of making calls (whether solicited or unsolicited) for direct marketing purposes except where that person -
(a) does not prevent presentation of the identity of the calling line on the called line; or
(b) presents the identity of a line on which he can be contacted.
(1) A person shall neither use, nor instigate the use of, a public electronic communications service for the purposes of making unsolicited calls for direct marketing purposes where -
(a) the called line is that of a subscriber who has previously notified the caller that such calls should not for the time being be made on that line; or
(b) the number allocated to a subscriber in respect of the called line is one listed in the register kept under regulation 26.
(2) A subscriber shall not permit his line to be used in contravention of paragraphs (A1) or (1).
(3) A person shall not be held to have contravened paragraph (1)(b) where the number allocated to the called line has been listed on the register for less than 28 days preceding that on which the call is made.