Article 6 Exemption subject to conditions
The exemption granted by Article 3 of this order in respect of the keeping and use of material falling within Article 4 of this order, not being material falling within the last preceding Article, is granted subject to the conditions that—
the weight of all the uranium and thorium contained in all the substances falling within paragraph (a) of the said Article 4 (including any of those substances contained in articles) present on the premises at any one time does not, in the aggregate, exceed two kilogrammes;
the weight of all the uranium and thorium contained in all the substances falling within the said paragraph (a) (including any of those substances contained in articles) brought on to the premises in any one month does not, in the aggregate, exceed two kilogrammes; and
if the material consists of a substance (but not if it consists of an article) kept for sale, it is kept in the immediate container in which it was supplied.