Illegal plate checklist — fail any of these and your plate is non-compliant
- ✗ Font is not Charles Wright 2001
- ✗ Characters wrong size (must be 79mm tall, 50mm wide)
- ✗ Spacing modified to spell a name or word
- ✗ Tinted, smoked, or coloured background
- ✗ Missing BS AU 145e stamp or supplier postcode
- ✗ Ghost plate / ANPR-defeat film or spray applied
- ✗ Plate dirty or obscured so characters can't be read
The Law: What DVLA Regulations Require
Number plate standards in the UK are governed by the Road Vehicles (Display of Registration Marks) Regulations 2001, as amended. Every plate manufactured and sold in the UK must be made by a DVLA-registered supplier and must conform to British Standard BS AU 145e (introduced in 2021, replacing BS AU 145d).
The regulations set mandatory requirements for font, character size, spacing, colour, materials, and markings. Failing to meet any one of these makes the plate non-compliant — there is no partial compliance. The fine for a non-compliant plate is up to £1,000 and your vehicle will fail its MOT.
Font: Charles Wright 2001
All UK number plates must use the Charles Wright 2001 font, and only this font. No other typeface is permitted. This includes:
- Bold or italic versions of Charles Wright
- Custom or "designer" fonts that look similar
- Fonts with decorative serifs, shadows, or outlines
- Compressed or stretched versions of the approved font
The Charles Wright font was designed specifically for number plate legibility. Its characters are optimised for ANPR camera recognition — the automated systems that read plates for speed cameras, ULEZ enforcement, Dartford Crossing tolls, and police intelligence. A plate with the wrong font may appear identical to a human but be unreadable or misread by an ANPR system, which is precisely why it is illegal.
Character Size and Spacing
Every character dimension is precisely specified:
| Measurement |
Required value |
| Character height |
79mm |
| Character width (most) |
50mm |
| Stroke width |
14mm |
| Gap between characters |
11mm |
| Gap between character groups |
33mm |
| Top, bottom, side margins |
11mm |
Modifying spacing is perhaps the most common violation associated with personalised number plates. The temptation to close up the gap in a registration like "B 19 ROB" to make it read "BIG ROB" is understandable — but illegal. Police are specifically trained to look for altered spacing, and it is one of the most frequently cited reasons for roadside stops.
Colour and Materials
The colour rules are absolute:
- Front plate: white reflective background, black characters
- Rear plate: yellow reflective background, black characters
No other colour combination is permitted for road use in Great Britain. Classic vehicles displayed at shows may use different historical formats, but not on public roads.
Tinted plates are completely illegal. The "smoked" or "darkened" look achieved by tinting films or sprays reduces the contrast between characters and background. Even a slight tint that looks subtle to the human eye can significantly impair ANPR camera readability. The fine is £100 and your vehicle will fail its MOT. Police can prohibit driving until compliant plates are fitted. See also our complete number plate rules guide for colour and material specifications in full.
ANPR Evasion: Ghost Plates and Stealth Treatments
Automatic Number Plate Recognition (ANPR) cameras are deployed across the UK road network — at motorway gantries, in police cars, at petrol forecourts, ULEZ boundary cameras, and toll plazas. They read plates at speed and check them against multiple databases simultaneously.
Ghost plates — also called stealth plates — use specialised treatments designed to cause the camera's infra-red flash to "wash out" the plate image, making characters unreadable while the plate appears normal to the human eye. These treatments include:
- Anti-camera sprays applied to the plate surface
- Infrared-reflective films placed over the plate
- Specially printed backgrounds designed to disrupt camera focus
- Covers with polarising filters
All of these are illegal. More significantly, their primary purpose — evading speed cameras, congestion charges, ULEZ fees, and criminal detection — carries serious consequences beyond the plate fine itself. Drivers who evade ULEZ or Dart Charge accumulate penalty charges, and deliberate ANPR evasion is treated as an aggravating factor in any related offences.
There is also a serious harm to innocent motorists: plate data from genuine ANPR reads is sometimes used to generate false penalty notices, or criminals deliberately mimic a genuine plate on a ghost-plate vehicle so that fines are sent to the wrong driver.
3D and 4D Number Plates: Are They Legal?
Yes — 3D gel and 4D laser-cut acrylic plates are legal in the UK provided they meet all other specifications. The raised or three-dimensional characters must:
- Use the Charles Wright 2001 font (the 3D form of each character must match the 2D profile)
- Be the correct dimensions (79mm × 50mm for most characters)
- Have correct inter-character and group spacing
- Be on the correct white/yellow reflective background
- Pass the BS AU 145e standard for ANPR readability
The key risk with 3D/4D plates is buying from suppliers who do not use the correct font profile for their raised characters, or who use materials that don't meet the British Standard. Always buy from a DVLA-registered supplier who can confirm their 3D/4D plates carry the required BS marking. New Reg can advise on compliant suppliers in your area.
Required Markings: The BS Stamp and Supplier Details
Since 2001, all number plates manufactured in the UK must display:
- The British Standard mark: BS AU 145d (pre-September 2021) or BS AU 145e (post-September 2021)
- The name and postcode of the supplying garage or plate manufacturer
- The CE mark (for plates manufactured before the UK left the EU) or UKCA mark
Plates without these markings are technically non-compliant, though enforcement tends to focus on plates that are visually deficient rather than simply missing the supplier stamp. However, the absence of markings is a red flag that the plate was not made by a DVLA-registered supplier — which carries its own risks.
Personalised Plates and Compliance
A personalised registration purchased from the DVLA or a registered dealer like New Reg is always a legal combination of characters. The registration itself cannot be "illegal" if it was legitimately issued. What can be illegal is how the plate is physically displayed — the font, spacing, colour, or materials used to manufacture it.
Some DVLA-banned combinations are withdrawn from sale each year because they are offensive. See our DVLA banned plates guide for the current withdrawn list and the reasoning behind banning decisions.
If you are unsure whether your existing plates are compliant, the safest approach is to have new plates made by a DVLA-registered supplier — it costs £20–40 and removes all doubt. This is especially worth doing before an MOT, as non-compliant plates are an automatic MOT failure.
MOT Checks and Number Plate Compliance
MOT testers are required to check number plates as part of the standard MOT inspection. They check for:
- Correct background colours (white front, yellow rear)
- Legibility — no damage, obscuring, or fading
- Correct font and character size (assessed visually)
- Presence of the BS standard marking
- Security of mounting (plates must not be loose)
A plate that fails the MOT cannot simply be "ignored" — the vehicle cannot receive an MOT certificate until compliant plates are fitted. This affects your ability to tax and insure the vehicle.
Selling a Car with Non-Compliant Plates
If you are selling your private plate before a car sale, ensure the replacement standard plates on the vehicle are compliant. A buyer who discovers non-compliant plates during a pre-purchase check may use this as a reason to renegotiate price or withdraw. Dealers who accept part-exchanges with illegal plates may refuse to complete the deal.
The transfer process for private plates is straightforward and should be completed before the car is sold. Once transferred or put on retention, the vehicle reverts to its original registration and standard plates are fitted.
