and shall also apply to any other description of oil which may be specified by regulations made by the Secretary of State, having regard to the provisions of any Convention accepted by Her Majesty’s Government in the United Kingdom in so far as it relates to the prevention of pollution of the sea by oil, or having regard to the persistent character of oil of that description and the likelihood that it would cause pollution if discharged from a ship into any part of the sea outside the territorial waters of the United Kingdom.