What is the National Mileage Register?

The National Mileage Register helps you check a car’s real mileage. Find out what it is, how it works, and why it matters.

Worried a used car’s mileage might be inaccurate? That’s where the National Mileage Register comes in. Our guide explains what it is, how it works, and how it helps uncover a car’s true mileage before you buy.

Remember, you can buy a used car right here on Carwow. We’re here to help you through every step of your car-changing journey.

What is the National Mileage Register?

The National Mileage Register (NMR) is a UK-based database run by a company called HPI. It aims to tackle mileage fraud, commonly known as “clocking,” by collecting and verifying vehicle mileage data from various sources, including the Driver and Vehicle Licensing Agency (DVLA). This helps ensure that car buyers can trust the mileage readings provided by sellers.

How does the National Mileage Register work?

The National Mileage Register (NMR) steps in when a potential mileage discrepancy is identified or if a car with unusually low mileage is being sold.

A dealer or finance company may request NMR to verify a car’s mileage history. NMR then does a series of checks, which can include contacting previous registered keepers to confirm the mileage at the time they sold the car.

This process is possible because NMR has an official agreement with the DVLA, allowing limited access to the details of all previous registered keepers for verification purposes.

If you receive a letter from NMR, you will be directed to their website. There, you will enter the vehicle’s registration number and the reference number from the letter, and then provide the mileage as requested.

Where does the National Mileage Register get its information?

The NMR gathers mileage data from multiple trusted sources to verify a car’s true mileage. These include:

• DVLA records which show official registration and ownership details.
• MOT test data which shows the mileage recorded during annual inspections.
• Leasing and rental companies which show mileage from leased or fleet vehicles.
• Dealers and manufacturers which show service and sales records.
• Vehicle owners who have self-reported mileage during ownership or sale.

By cross-referencing these sources, NMR can identify discrepancies and help prevent mileage fraud.

Can I check a car’s mileage using the National Mileage Register?

No, private buyers usually cannot access NMR directly as it’s a service designed for motor trade professionals, such as dealers, leasing companies, and retailers.

However, you can still check a car’s mileage using vehicle history checks, which often include NMR data. These checks usually cost money, so they’re best used for cars you’re seriously considering buying.

Fortunately, our MOT history check can give you a rough idea of a car’s mileage accuracy, as it shows the odometer reading at the last MOT. For example, if a car is advertised as having 60,000 miles but the last MOT recorded 85,000, this is a clear sign that something may be wrong.

Should I buy a car with a mileage discrepancy?

In general, we would urge extreme caution if buying a car with a mileage discrepancy.

First, a car with a lower recorded mileage is usually worth more than a similar vehicle with higher mileage. This means you could end up paying more than the car is actually worth.

Second, if a car has been clocked, there are likely other questions about its history. Can you trust that the service records are legitimate? Has it been poorly repaired after an accident that doesn’t show up on a history check because insurance wasn’t involved?

There are some rare circumstances where a mileage discrepancy may be legitimate, such as if the odometer or dashboard had to be replaced, or if an incorrect reading was entered during an MOT test. In these cases, there should be full transparency from the seller, supported by documents, and the DVLA should be notified of any MOT errors within 28 days.

Overall, it’s best to be wary of any car flagged with a mileage discrepancy.

What if my car has a discrepancy on the National Mileage Register?

If a car you’ve just bought from a dealer shows a discrepancy on the NMR, your first step should be getting in touch with your local Trading Standards office. If you bought the car privately, the Citizens Advice Bureau can guide you. Because mileage tampering is usually treated as a civil matter, the police generally won’t get involved.

If you believe the discrepancy is an error, you’ll need to submit written evidence to support your claim, such as your car’s service or MOT history. HPI will review the evidence and, if appropriate, update the NMR to correct the mistake.

National Mileage Register FAQs

Is the National Mileage Register compulsory?

No, the National Mileage Register (NMR) isn’t compulsory, but it’s a handy tool for checking a car’s mileage history. While you don’t have to use the register, UK law does require sellers to be honest about a vehicle’s mileage and to tell you about any known discrepancies.

Can I change mileage on the National Mileage Register?

No, you can’t just change a car’s mileage on the NMR yourself. But if you think there’s a mistake, you can ask for it to be updated. You’ll need to show proof – such as service or MOT records – and HPI will check it. If it’s a genuine error, they’ll correct their records.

How accurate is the National Mileage Register?

The NMR is a great tool for spotting mileage issues, but it’s only as accurate as the data it gets from third parties. It’s one of the biggest and most reliable sources for checking mileage and flagging possible “clocking,” but mistakes can happen such as wrong readings being entered during an MOT or service. It’s a useful starting point, but always verify the details with official documents such as MOT certificates, service history, and the V5C logbook.

Can mileage records be amended on NMR databases?

Yes, you can get mileage records on the NMR updated if you provide proof, such as service history or MOT records, to the database provider.

Car change? Carwow!

Looking for a new set of wheels? With Carwow you can sell your car quickly and for a fair price – as well as find great offers on your next one. Whether you’re looking to buy a car brand new, are after something used or you want to explore car leasing options, Carwow is your one stop shop for new car deals.

Click here to follow us on WhatsApp, where you can keep up-to-date with all the latest news, reviews, advice guides and videos.