7.—If the Commissioner F9[, the F10[Police Ombudsman]] or the Chief of Staff of the Defence Forces, as may be appropriate, considers that interceptions to which an authorisation relates are no longer required, then, without delay—

(a) he shall so inform the nominated officer, and

(b) the latter shall inform the person to whom the warrant concerned is addressed,

and thereupon the authorisation shall cease to be in force.