# Data sources | RegFlags

RegFlags is built entirely on official, openly licensed data. We work out scores, flags and comparisons ourselves, and the AI-assisted summary only uses facts from these sources.

## DVSA MOT History API

Live MOT history for every check: tests, results, mileage readings, defects and advisories, and the outstanding recall flag.

Licence: Open Government Licence v3.0. Source: https://documentation.history.mot.api.gov.uk/

## DVSA anonymised MOT tests and results

Aggregated into first-time pass rates, common failures and typical mileage for each make, model, age and fuel, so we can compare a car with similar ones.

Licence: Open Government Licence v3.0. Source: https://www.data.gov.uk/dataset/c63fca52-ae4c-4b75-bab5-8b4735e1a4c9/anonymised-mot-tests-and-results

## Department for Transport vehicle licensing statistics (VEH0120)

How many of each model are still licensed and on the road in Great Britain, and how that compares with the peak.

Licence: Open Government Licence v3.0. Source: https://www.gov.uk/government/statistical-data-sets/vehicle-licensing-statistics-data-files

## VehiclesDB

The make and model names we recognise, body types and model popularity, reconciled from official vehicle registers. Vehicle data by VehiclesDB, licensed CC BY 4.0 (creativecommons.org/licenses/by/4.0); we adapted it, keeping the models on GB roads and matching them to DVSA's names.

Licence: CC-BY 4.0. Source: https://vehiclesdb.com

## DVSA vehicle safety recalls

Manufacturer recalls for each model, matched to a vehicle by its build date. Always confirm with the official recall checker.

Licence: Open Government Licence v3.0. Source: https://www.check-vehicle-recalls.service.gov.uk/

## Vehicle Certification Agency car fuel and emissions data

The Euro emissions standard each car version was approved to, from July 2000, matched by make, model, fuel and engine size for the ULEZ check when DVLA's record isn't available.

Licence: Open Government Licence v3.0. Source: https://carfueldata.vehicle-certification-agency.gov.uk/

## DVLA Vehicle Enquiry Service (when enabled)

Tax status, Euro emissions standard and export marker, which make the ULEZ check exact instead of an estimate.

Licence: Open Government Licence v3.0. Source: https://developer-portal.driver-vehicle-licensing.api.gov.uk/

## Ordnance Survey Code-Point Open and ONS geography lookups

Where each postcode district is and which region it is in, so dealer market figures can be grouped locally, regionally and nationally. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v.3.0.

Licence: Open Government Licence v3.0. Source: https://www.ordnancesurvey.co.uk/products/code-point-open

## Clean air zone rules (TfL and GOV.UK)

Used to estimate ULEZ and Clean Air Zone compliance from fuel type and first registration date. Always check the official checker.

Licence: Published guidance. Source: https://www.gov.uk/clean-air-zones

Contains public sector information licensed under the Open Government Licence v3.0. RegFlags doesn't check outstanding finance, theft or insurance write-offs. Those need a paid vehicle history check from a specialist provider.

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Canonical page: https://regflags.co.uk/data-sources
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