(1) The VPCM may cancel or vary an authority if the VPCM reasonably believes that—
(a) the conduct of a hazardous port activity under the authority could place the safety of people, property or the environment at risk; or
(b) the conduct of a hazardous port activity under the authority could interfere with the orderly and efficient management of the port or of other activities authorised in the port; or
(c) the holder of the authority has not complied with a condition of the authority; or
(d) the holder of the authority has contravened a provision of these Regulations.
(2) The VPCM may cancel or vary an authority on the grounds set out in subregulation (1) during a period in which the authority is suspended under regulation 13 or 15.