Vehicle registration plates of the United Kingdom

Vehicle registration plates are the mandatory alphanumeric plates used to display the registration mark of a vehicle, and have existed in the United Kingdom since 1903. It is compulsory for motor vehicles used on public roads to display vehicle registration plates, with the exception of vehicles of the reigning monarch used on official business.

The Motor Car Act 1903, which came into force on 1 January 1904, required all motor vehicles to be entered on an official vehicle register, and to carry alphanumeric plates. The Act was passed in order that vehicles could be easily traced in the event of an accident or contravention of the law. Vehicle registration alphanumeric plates in the UK are rectangular or square in shape, with the exact permitted dimensions of the plate and its lettering set down in law. Front plates are white, whereas back plates are yellow.

Within the UK itself there are two systems: one for Great Britain, which dates from 2001, and another for Northern Ireland, which is similar to the original 1904 system. Both systems are administered by the Driver and Vehicle Licensing Agency (DVLA) in Swansea; until July 2014, Northern Ireland's system was administered by the Driver and Vehicle Agency (DVA) in Coleraine, which had the same status as the DVLA. Other schemes relating to the UK are also listed below.

Number plates must be displayed in accordance with the Road Vehicles (Display of Registration Marks) Regulations 2001.

All vehicles manufactured after 1 January 1973 must display number plates of reflex-reflecting material, white at the front and yellow at the rear, with black characters. This type of reflecting plate was permitted as an option from 1968: many vehicles first registered before 1973 may therefore carry the white/yellow reflective plates and, where they were first registered during or after 1968, they may have carried such plates since new. Many buses delivered to London Transport between 1973 and the mid-1980s continued to bear white-on-black plates.

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