6Certificate of initial fitness (or equivalent) required for use as public service vehicles
(1)A public service vehicle adapted to carry more than eight passengers shall not be used on a road unless—
(a)a certifying officer has issued a certificate (in this Act referred to as a " certificate of initial fitness ") that the prescribed conditions as to fitness are fulfilled in respect of the vehicle; or
(b)a certificate under section 10 of this Act has been issued in respect of the vehicle; or
(c)there has been issued in respect of the vehicle a certificate under section 47 of the [1972 c. 20.] Road Traffic Act 1972 (type approval) of a kind which by virtue of regulations is to be treated as the equivalent of a certificate of initial fitness.
(2)Subject to section 68(3) of this Act, if a vehicle is used in contravention of subsection (1) above, the operator of the vehicle shall be liable on summary conviction to a fine not exceeding £500.