(1) It shall not be lawful for a small public service vehicle which is fitted with a taximeter to be used as a street service vehicle during lighting-up hours unless -
(a) there is fitted to such vehicle a lamp so situated as to illuminate when lit the dial of the taximeter fitted to such vehicle, and
(b) such lamp is lit and in efficient condition.
(2) Whenever a small public service vehicle is used as a street service vehicle in contravention of this section the owner of such vehicle and also the driver thereof shall each be guilty of an offence under this section and shall on summary conviction thereof be liable to a fine not exceeding two pounds.