MOT information
Can illegal number plates fail an MOT?
Yes. A number plate that fails the MOT requirements is a major defect and will cause an MOT failure. Check your plates before test day and choose a compliant replacement if you spot a problem.
Our road-legal plates
100% road legal. Made to pass the number plate MOT check.
We supply 100% road-legal number plates when you select a road-legal configuration. Our road-legal plates are made to the applicable display rules and BS AU 145e requirements, with the correct registration layout and required supplier markings.
They will pass the number plate part of an MOT when the correct plates are fitted securely to the appropriate vehicle, kept clean and in good condition, and left unaltered and unobstructed. This covers the plates; the rest of your vehicle must also meet the MOT requirements. Show plates and show-only configurations are for display or off-road use and are not covered by this road-legal statement.
Shop road-legal plates →What causes a number plate MOT failure?
The DVSA inspection manual lists these four number plate defects as major:
Missing or insecure plate
A required plate is absent or attached so poorly that it could fall off.
Unreadable registration
The registration is missing or cannot be read clearly.
Incorrect registration
The displayed registration does not match the vehicle.
Non-conforming plate
The plate does not meet the specifications checked during the MOT.
Typical problems include obviously incorrect fonts or spacing, tints that affect legibility, patterned backgrounds, severe deterioration and screws that make one character look like another. Vehicle age and type affect the rules; historic vehicles and some imports have specific exceptions.
Road legality and an MOT pass
Passing an MOT does not prove every aspect of a plate is road legal. The DVSA manual says testers do not check the supplier name, postcode or British Standard number. Those markings are still required on new road-use plates. A missing marking should not be described as an automatic MOT failure on its own.
Current road-use plates need reflective backgrounds, black characters, the prescribed font and spacing, and the correct front or rear colour. For plates fitted after 1 September 2021, the characters must be a single shade of black. Read our legal plates and document guide for more detail.
Can 3D gel and 4D acrylic plates pass?
Yes. Raised characters are permitted; a 3D or 4D style is not itself a reason to fail. The complete plate must comply, including the character colour, dimensions, spacing and readability. A style name alone is not proof of compliance. Choose a road-legal configuration and do not alter it after manufacture.
Before your MOT: a quick plate check
- Check that the registration matches your vehicle and the front and rear plates agree where both are required.
- Clean both plates and look for damage, peeling layers or loose characters.
- Check that fixings are secure and do not change the appearance of any letter or number.
- Remove anything that obstructs the registration; do not add tinting or camera-blocking films.
- Choose the correct road-legal format for your vehicle. Ask us before ordering if you are unsure.
Need replacements or help fitting them? Contact us, check our size guide or arrange our professional fitting service.
Official guidance
This guide summarises the Great Britain MOT rules. Check the official guidance for your vehicle and any applicable exceptions.
- DVSA MOT inspection manual: cars and passenger vehicles
- DVSA MOT inspection manual: motorcycles
- GOV.UK: rules for number plates
Guidance checked: 10 October 2026.