Electronic communication of requests, applications or notices

21.—(1) Subject to paragraph (2), a requirement in these Regulations that any request, application or notice should be in writing is satisfied where (apart from the usual meaning of that expression) the text of it —

(a) is transmitted by electronic communication;

(b) is received in legible form; and

(c) is capable of being used for subsequent reference.

(2) Paragraph (1) shall not apply to any notice required or authorised to be given to or served by a billing authority on any person by Schedule 4 or any information required by paragraph 3(2) of that Schedule.