42. An empty packaging that has previously contained radioactive material may be transported as an excepted package if (but only if)—
(a)it is in a well maintained condition and is securely closed;
(b)the outer surface of any uranium or thorium in its structure is covered with an inactive sheath made of metal or of some other substantial material;
(c)the level of internal non-fixed contamination does not exceed 100 times the levels that are specified in paragraph (2)(a) of regulation 37 (requirements and controls for contamination and for leaking packages); and
(d)any labels that may have been displayed on it in conformity with the labelling requirements of regulation 48 (responsibilities of consignors) are no longer visible.