What UK license plates show and how to read them
A UK license plate is a metal or plastic rectangle displaying a registration number that identifies a specific vehicle. The format changed in 2001 and has remained consistent since, making it straightforward to decode once you know the pattern.
Every UK plate follows this structure: two letters, two numbers, then three letters. The first two letters identify the local DVLA office that issued the registration. The two numbers show the age of the vehicle — they change twice yearly, in March and September. The final three letters are random and unique to that vehicle.
For example, a plate reading AB21 XYZ tells you the vehicle was registered at an DVLA office in the AB postcode area and first registered between September 2021 and February 2022. The XYZ portion has no meaning beyond being a unique identifier.
Key Takeaways
- UK plates use a two-letter, two-number, three-letter format that reveals the registration office and the vehicle's age within a six-month window.
- The age identifier changes on 1 March and 1 September each year, so a vehicle registered in April will have a different age number than one registered in February.
- The blue section on the left of the plate shows the EU flag and the letters GB, which identifies the vehicle as registered in Great Britain.
- Personalised plates can be purchased from the DVLA, but they must still follow the same format and cannot be transferred between vehicles without a fee.
- Northern Ireland plates use a different format and display an Irish flag instead of the GB identifier.
How the age identifier works
The two-digit age code is the quickest way to estimate when a vehicle entered the road. The first digit represents the year within a ten-year cycle, and the second digit represents the registration period — either 51 for March to August, or 02 for September to February.
A plate showing 70 means the vehicle was registered between September 2020 and February 2021. A plate showing 71 means March to August 2021. This system repeats every twenty years, so a plate from 2001 and one from 2021 will have the same first digit but different context based on the vehicle's condition and history.
This matters because buyers and insurers use the age code to verify a vehicle's history. A car claiming to be from 2015 but displaying a 2010 age code is a red flag for odometer tampering or title washing.
The regional identifier and what it tells you
The first two letters on a UK plate correspond to the DVLA local office that processed the registration. These are based on postcode areas, so AB represents Aberdeen, BD represents Bradford, and SO represents Southampton.
This identifier does not mean the vehicle is currently in that region — it straightforward shows where the registration was first issued. A car registered in London in 2015 could be in Cornwall today, and the plate will still display the original London code.
The full list of regional codes is published by the DVLA and can be found on their website. Knowing the code is useful if you are buying a vehicle and want to verify the registration office matches the paperwork provided by the seller.
Personalised plates and how they work
The DVLA allows vehicle owners to purchase personalised registration numbers that spell out words, initials, or dates. These plates must still follow the legal format — they cannot be shorter, longer, or use characters that fall outside the standard set.
A personalised plate might read AB21 JMS (where JMS are the owner's initials) or AB21 LOL (a word). The age identifier and regional code remain mandatory, so you cannot create a plate that looks older or newer than it actually is.
Personalised plates cost between £250 and several thousand pounds depending on how desirable the combination is. They can be transferred to another vehicle for a fee, or retained on a certificate if you sell the car and want to use it again later. The DVLA maintains a waiting list for particularly sought-after combinations.
Northern Ireland plates and how they differ
Vehicles registered in Northern Ireland use a different format and display an Irish flag instead of the GB identifier. A Northern Ireland plate reads as a single letter, then a year code, then a number, then two letters — for example Z12 ABC.
The single letter at the start represents the local office, and the year code works similarly to the GB system, changing twice yearly. Northern Ireland plates are not interchangeable with GB plates, and a vehicle cannot legally display one format in the other region.
If you are buying a vehicle registered in Northern Ireland and plan to use it in Great Britain, you will need to re-register it with a GB DVLA office and receive a new plate. This is a separate process from a standard change of ownership.
What the blue section on the left means
The blue rectangle on the left side of a UK plate displays the EU flag and the letters GB. This section identifies the vehicle as registered in Great Britain and is a legal requirement on all plates issued since 2001.
Some older vehicles registered before 2001 may display plates without this section, but they are not legal for road use without updating to the current format. If you own a vehicle with an older plate style, you can request a replacement from the DVLA at no cost.
The blue section also serves a practical purpose at borders — it when ready identifies the vehicle's country of origin to traffic enforcement and customs officials. Removing, obscuring, or altering this section is illegal and can result in a fine.
Checking a vehicle's registration and spotting fakes
Before buying a used vehicle, you should verify that the registration plate matches the V5C registration document (the vehicle's logbook). The registration number, age code, and regional identifier should all align with the paperwork and the vehicle's condition.
Cloned plates — where a legitimate registration number is copied onto a different vehicle — are a common fraud. The DVLA provides a free vehicle check service on their website where you can enter a registration number and see the recorded keeper, vehicle type, and MOT history. If the details do not match what the seller is telling you, walk away.
Fake or altered plates are illegal to display and can result in prosecution. If you suspect a vehicle is displaying a cloned or false plate, you can report it to the police or the DVLA's enforcement team.
Frequently Asked Questions
Can I keep my old registration plate if I sell my car?
Yes. You can transfer your registration to a new vehicle, or retain it on a certificate for up to ten years and use it on a future vehicle. The DVLA charges a fee to transfer or retain a plate. If you do not transfer it, the plate is automatically reassigned to a new vehicle when the current one is scrapped or sold.
What does it mean if a plate has a zero instead of the letter O?
UK plates use the number zero, not the letter O, to avoid confusion. A plate reading AB21 0YZ (with a zero) is perfectly legal. This is standard across all UK registrations and does not indicate anything unusual about the vehicle.
Can I display a plate from a different country on my UK vehicle?
No. A vehicle registered in the UK must display a UK plate at all times when on the road. If you are moving abroad, you must re-register the vehicle in that country and receive a plate in the local format. Displaying a foreign plate on a UK-registered vehicle is illegal.
How do I report a vehicle with a cloned or fake plate?
Contact your local police non-emergency line or report it online through the police website. You can also report it to the DVLA's enforcement team. Provide the registration number, vehicle description, location, and time you saw it if possible. The DVLA will investigate and take action if fraud is confirmed.
What happens if my plate is damaged or unreadable?
You must replace it. Driving with a damaged, faded, or obscured plate is illegal and can result in a fine. You can order a replacement from the DVLA or from an approved number plate supplier. Replacement plates cost between £20 and £50 depending on the material and supplier.