# The Road Vehicles (Display of Registration Marks) Regulations 2001, Paragraph 2


A plate displaying white, silver or light grey letters and numbers on a black surface having every character indelibly inscribed on the surface or so attached to the surface that it cannot readily be detached from it, which may either—
(a) be made of cast or pressed metal with raised characters, or
(b) consist of a plate to which separate characters are attached, or
(c) consist of a plastic plate having either reverse engraved characters or characters of a foil type, or
(d) consist of an unbroken rectangular area on the surface of the vehicle which is either flat or, if there is no flat area where the mark is required to be displayed, an area which is almost flat.

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Source: https://www.legislation.gov.uk/uksi/2001/561/schedule/2/part/3/paragraph/2n4 (the official version)
Page: https://openlegislation.uk/road-vehicles-display-of-registration-marks-regulations-2001/schedule-2/part-3/paragraph-2n4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.