4Experimental licences
(1)Subject to the provisions of this section, where an application for the grant or renewal of a wireless telegraphy licence is made to the Postmaster General by a British subject and the Postmaster General is satisfied that the only purpose for which the applicant requires the licence is to enable him to conduct experiments in wireless telegraphy for the purpose of scientific research, the Postmaster General shall not refuse to grant or renew the licence and shall not revoke the licence when granted, and no sum shall be payable under the regulations under section two of this Act otherwise than on the issue or renewal of the licence.
(2)Nothing in subsection (1) of this section shall limit the discretion of the Postmaster General as to the terms, provisions or limitations which he attaches to any licence or his power to vary the terms, provisions or limitations of any licence.
(3)Nothing in subsection (1) of this section shall prevent the Postmaster General from refusing to grant or renew, or from revoking, any licence if, whether before or after the grant or last renewal of the licence, the applicant has been convicted of any offence under this Part of this Act, whether in relation to the same or any other apparatus, or has contravened any of the terms, provisions or limitations of that or any other wireless telegraphy licence granted to him, or has been convicted under Part II of this Act of using any apparatus for the purpose of interfering with any wireless telegraphy.
(4)If it appears to the Postmaster General that, by reason of the existence of a national emergency, it is expedient so to do, he may, by a notice in writing served on the holder of any licence granted in pursuance of this section, revoke that licence, or by a general notice published in the London, Edinburgh and Belfast Gazettes, revoke all licences granted in pursuance of this section which are for the time being in force, and the Postmaster General shall not be obliged by virtue of this section to grant or renew any licence, if it appears to him, by reason of the existence of such an emergency, inexpedient so to do.