(1) A provider of number-based interpersonal communications services which attributes numbers from a numbering plan shall ensure that all its subscribers are, without charge -

(a) informed, before they are included in any directory for which the provider provides relevant information in accordance with Regulation 95 of the Electronic Communications Code Regulations and in which their personal data can be included, about the purpose of such a directory and any further usage possibilities based on search functions embedded in electronic versions of that directory,

(b) given the opportunity to determine whether their personal data are included in that directory, and

(c) given the opportunity to determine which of their personal data are included in that directory to the extent that such data are relevant for the purpose of the directory as determined by the provider of the directory and to verify, correct or withdraw such data.

(2) Any other person responsible for the collection and making available of a subscriber's data for inclusion in any other directory of subscribers shall ensure that the subscribers are, without charge -