2(1)An officer may enter and search any premises for the purpose of ascertaining—N.I.
(a)whether there are any munitions unlawfully on the premises, or
(b)whether there is any wireless apparatus on the premises.
(2)An officer may not enter a dwelling under this paragraph unless he is an authorised officer and he reasonably suspects that the dwelling—
(a)unlawfully contains munitions, or
(b)contains wireless apparatus.