(1)Nothing in Part II of this Act applies in relation to any vehicle which—
(a)at the relevant time is used or appropriated for use for naval, military or airforce purposes;
(b)belongs to any visiting forces (within the meaning of the [1952 c. 67.] Visiting Forces Act 1952); or
(c)at the relevant time is used or appropriated for use, by any such forces.
(2)Sections 66 and 69 to 71 of this Act apply to—
(a)vehicles in the public service of the Crown which are required to be registered under the [1971 c. 10.] Vehicles (Excise) Act 1971 (other than those which are exempted by subsection (1)(a) above); and
(b)persons in the public service of the Crown.