Charging zones decide whether you pay from the vehicle's Euro emission standard and category in national records. Records are sometimes wrong, especially for imports, conversions, older petrol cars that met Euro 4 early, and vehicles with an incorrect category. If your vehicle really meets the standard or was exempt, no charge was payable, and that is a full legal ground.
The standards
| Vehicle | Clean Air Zones and ULEZ | Scottish LEZs |
|---|---|---|
| Petrol cars and vans | Euro 4 | Euro 4 |
| Diesel cars and vans | Euro 6 | Euro 6 |
| Buses, coaches, HGVs | Euro VI (CAZ); LEZ applies in London | Euro VI diesel, Euro IV petrol |
| Motorcycles | Euro 3 | Not restricted |
Sources: GOV.UK Clean Air Zones, TfL ULEZ standards and mygov.scot.
Proving the Euro standard
- Section D.2 of the V5C, if it shows the Euro class.
- A letter or certificate of conformity from the manufacturer stating the Euro standard for your VIN. Bradford specifically accepts a manufacturer build sheet.
- For a retrofit, the CVRAS certificate.
Exemptions you had
If you held an approved exemption on the day, send the approval. Many local exemptions start only after approval and are not backdated (Bradford and Sheffield say so), and some have ended: Birmingham's resident exemption ended on 31 May 2023, Bath's Blue Badge exemption on 14 March 2023, and Bristol's Blue Badge exemptions on 31 March 2023.
The ground
- England: no road user charge or penalty charge was payable (SI 2013/1783 reg 8(3)(e)).
- London: no penalty charge is payable under the scheme (SI 2001/2313 reg 13(3)(c)).
- Scotland: the contravention did not occur (SSI 2021/177 reg 8(4)(a)).
Can I challenge this charge? Free check
Free. Your answers stay on this device. Nothing is sent to us.
Get your letter written for you
Built from your checker answers, with the right grounds and regulation numbers for your scheme. You see the start of the letter before you pay, then edit it and download it as Word or PDF.
Representation letter
Your formal challenge to the authority, citing each ground that fits with its regulation number, the evidence you enclose and a request to cancel.
Start my letterFull pack
The representation, a tribunal appeal statement, replies at the charge certificate and debt registration stages, witness statement and out-of-time wording, and a bailiff fee check.
Start the full packOne penalty per purchase, usable for 6 months. Full refund within 14 days if you haven't downloaded a letter. Templates you send yourself, not legal advice. See sample letters
Questions people ask
The checker says my car is non-compliant but the manufacturer says Euro 4.
Send the manufacturer letter with your representations and ask the operator to update the record so future journeys are not charged.
Sources
Last checked: 13 November 2026. Every fact on this page was checked against these official pages. How we check