In addition to the conditions specified in section 26, if a person is required to retain information that is contained in an electronic communication,—
(a)
the person must also retain such information obtained by that person as enables the identification of—
(i)
the origin of the electronic communication; and
(ii)
the destination of the electronic communication; and
(iii)
the time when the electronic communication was sent and the time when it was received; and
(b)
the information referred to in paragraph (a) must be readily accessible so as to be usable for subsequent reference.