A person who contravenes or fails to comply with any provision of regulations under either of the two preceding sections shall be guilty of an offence and liable—
(a) on conviction on indictment to a fine; and
(b) on summary conviction to a fine not exceeding £400:
Regulations under each of the two preceding sections shall, subject to any provision to the contrary in the regulations, apply to fuel used for, and to persons in, the public service of the Crown as they apply to fuel used for other purposes and to other persons; but a local authority shall not be entitled by virtue of this subsection to exercise, in relation to fuel used for and persons in that service, any power conferred on the authority by virtue of sections 91 to 93 of this Act.