(1) At any time while an authorisation is in force, a member of the Garda Síochána not below the rank of chief superintendent (in this Part referred to as the "member") may, subject to this section, issue a direction to an undertaking where, and only where, the member is satisfied that -

(a) the serious threat on the basis of which the authorisation was granted, continues to exist, and

(b) any other means of averting that threat that are at the disposal of the Garda Síochána are less likely to result in the serious threat being averted.

(2)

(a) Subject to paragraph (b), a direction shall be issued in writing and shall be signed by the member.

(b) Where the member considers that the case is one of exceptional urgency, he or she may issue a direction orally provided that the direction shall be confirmed in writing as soon as practicable.

(3) Subject to subsection (4), a direction -

(a) shall state the name of the undertaking to which it is issued,