Glossary
Vehicle Registration Number (VRN / Number Plate)
Direct Answer / TL;DR
What is Vehicle Registration Number (VRN / Number Plate)?
The unique alphanumeric identifier assigned to every UK vehicle by the DVLA. In the current format (e.g., AB23 CDE), the letters encode the registration office, year, and a unique suffix. WorthThePump uses your VRN to look up your car's fuel type and MPG automatically.
Why does it matter for UK drivers?
UK vehicle registration numbers have followed several formats over the decades. The current format, introduced in September 2001, is structured as: two area letters (AA) + two-digit year identifier (51) + three random letters (AAA). The year identifier changes every March and September — so cars registered March–August 2023 carry '23', while September 2023–February 2024 cars carry '73'.
Private (personalised) plates can be transferred between vehicles. A car showing 'A1 WTP' might be a 2020 vehicle with a cherished plate — the DVLA VES API returns the actual vehicle's technical details regardless of what the plate looks like.
For WorthThePump, the VRN is the input for the DVLA lookup. You type your plate, we look up make, fuel type, and engine specs, and then derive your MPG estimate — all without you needing to know the technical specs of your car. Most drivers know their plate but not their exact fuel consumption figure.
GDPR note: for anonymous users, WorthThePump does not store your VRN after the calculation session ends. Vehicle data (make, fuel type, MPG) is cached against the plate for 24 hours for performance, but is not linked to any personal profile. For registered users with saved vehicles, the plate is stored with their account and can be deleted at any time.
Alternative terms: registration number, reg plate, number plate, licence plate. In Scotland and Wales, the same DVLA system applies. Northern Ireland uses older plate formats (e.g., AYZ 123) and is also registered via DVLA.
Related terms
Further reading
Now you know what Vehicle Registration Number (VRN / Number Plate) means —
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