43 Obscured registration mark.U.K.
(1)If a registration mark fixed on a vehicle as required by virtue of section 23 is in any way—
(a)obscured, or
(b)rendered, or allowed to become, not easily distinguishable,
the relevant person is guilty of an offence.
(2)A person guilty of an offence under subsection (1) is liable on summary conviction to a fine not exceeding level 3 on the standard scale.
(3)In subsection (1) “the relevant person” means the person driving the vehicle or, where it is not being driven, the person keeping it.
(4)It is a defence for a person charged with an offence under this section to prove that he took all steps which it was reasonably practicable to take to prevent the mark being obscured or rendered not easily distinguishable.