13.—(1) The competent authority may decide that a shipment may not be completed if it is not in accordance with these Regulations or in accordance with its authorisation granted under these Regulations.
(2) If the competent authority so decides it must immediately inform the competent authorities in all countries involved in the shipment.
(3) In the case of radioactive waste or spent fuel that has been brought into the United Kingdom, the person holding the authorisation granted under these Regulations must either return the consignment to the country of origin if instructed to do so by the competent authority, taking corrective safety measures if necessary, or otherwise dispose of it as instructed by the competent authority and failure to comply with an instruction of the competent authority is an offence.
(4) In the case of radioactive waste or spent fuel that is being or has been shipped from the United Kingdom—
(a)unless alternative safe arrangements can be made, the competent authority must serve a notice on the person holding the authorisation requiring the authorised person to take the shipment back, and
(b)the person holding the authorisation must comply with the notice, taking corrective safety measures if necessary, and failure to do so is an offence.
(5) The person holding the authorisation is liable for costs arising if a shipment is not completed.