s 3 Exempt trades.
(1) It is a defence for a person charged with an offence under section 1 to prove that— (a) the knife was marketed— (i) for use by the armed forces of any country; (ii) as an antique or curio; or (iii) as falling within such other category (if any) as may be prescribed; (b) it was reasonable for the knife to be marketed in that way; and (c) there were no reasonable grounds for suspecting that a person into whose possession the knife might come in consequence of the way in which it was marketed would use it for an unlawful purpose. (2) It is a defence for a person charged with an offence under section 2 to prove that— (a) the material was published in connection with marketing a knife— (i) for use by the armed forces of any country; (ii) as an antique or curio; or (iii) as falling within such other category (if any) as may be prescribed; (b) it was reasonable for the knife to be marketed in that way; and (c) there were no reasonable grounds for suspecting that a person into whose possession the knife might come in consequence of the publishing of the material would use it for an unlawful purpose. (3) In this section “ prescribed ” means prescribed by regulations made by the Secretary of State.