170(1) The Secretary of State may with the concurrence of the Treasury make regulations modifying this Part of this Act in such manner as he thinks proper in their application to any person who is, has been or is to be–
(a)employed on board any ship, vessel, hovercraft or aircraft;
(b)outside Great Britain at any prescribed time or in any prescribed circumstances; or
(c)in prescribed employment in connection with continental shelf operations, as defined in section 120(2) above.
170(2) Regulations under subsection (1) above may in particular provide–