(1)Subject to the preceding provisions of this Part of this Act and to subsection (2) below, this Part of this Act and any regulations made under it shall have effect in relation to persons in the public service of the Crown, vehicles belonging to, or used for the purposes of, a Minister of the Crown or Government department and things done, or omitted to be done, in connection with such vehicles by such persons as they have effect in relation to other persons or vehicles.
(2)Regulations made under section 25 or 26 of this Act may provide that, in their application in relation to—
(a)vehicles belonging to the Crown and used for naval, military or air force purposes; and
(b)vehicles used for the purposes of any such body, contingent or detachment of the forces of any country as is a visiting force for the purposes of any of the provisions of the [1952 c. 67.] Visiting Forces Act 1952, or used for the purposes of any headquarters or organisation designated by an Order in Council under section 1 of the [1964 c. 5.] International Headquarters and Defence Organisations Act 1964;
the regulations shall have effect subject to such modifications as may be prescribed.