6Application for issue of an interception warrant
(1)An interception warrant shall not be issued except on an application made by or on behalf of a person specified in subsection (2).
(2)Those persons are—
(a)the Director-General of the Security Service;
(b)the Chief of the Secret Intelligence Service;
(c)the Director of GCHQ;
(d)the Director General of the National Criminal Intelligence Service;
(e)the Commissioner of Police of the Metropolis;
(f)the Chief Constable of the Royal Ulster Constabulary;
(g)the chief constable of any police force maintained under or by virtue of section 1 of the [1967 c. 77.] Police (Scotland) Act 1967;
(h)the Commissioners of Customs and Excise;
(i)the Chief of Defence Intelligence;
(j)a person who, for the purposes of any international mutual assistance agreement, is the competent authority of a country or territory outside the United Kingdom.
(3)An application for the issue of an interception warrant shall not be made on behalf of a person specified in subsection (2) except by a person holding office under the Crown.