An Order in Council under F1section 23 of the Oil and Gas Enterprise Act 1982 may make provision for treating for the purposes of the F2Radioactive Substances Act 1993 and any orders and regulations made thereunder any installation in an area or part with respect to which provision is made under that section and any waters within five hundred metres of such an installation as if they were situated in such part of the United Kingdom as may be specified in the Order, and for modifying the provisions of that Act in their application to such an installation or waters.