(1) A relevant authority may give a relevant document by fax only if the person to whom it is to be given has indicated in writing to that authority (and has not withdrawn the indication) -

(a) that he is willing to receive relevant documents by fax, and

(b) the fax number to which such documents should be sent.

(2) If a relevant authority gives a relevant document by fax it must, by the end of the business day following the day on which it did so, send a copy of that document to the person to whom the document is to be given by any method specified in regulation 2 other than fax.

(3) A relevant authority may give a relevant document by any other electronic means of communication only if the person to whom it is to be given -

(a) has indicated in writing to that authority (and has not withdrawn the indication) that he is willing to receive relevant documents by those means, and

(b) has provided, in writing to that authority for this purpose, an e-mail address, or other electronic identification such as an ISDN or other telephonic link number.