Compare Vehicles

What side-by-side comparison is for

Comparing vehicles side by side is most useful when you have narrowed your search to a small number of candidates and need to decide between them. The tool lets you place up to three UK vehicles next to each other and read their details in one view, rather than opening several browser tabs and trying to hold the figures in your head. Because the data is drawn from official DVLA and DVSA records, the comparison reflects what the government holds on each registration, not what an advert claims.

In practice this supports three common tasks: shortlisting used cars before you travel to see them, checking that a seller's description matches the official record, and spotting a vehicle whose MOT or tax is about to lapse before you commit any money or time.

What the comparison shows

For each vehicle you add, the tool displays its specifications alongside its current tax status, MOT status and the relevant expiry dates. That combination is what makes the comparison worth running: specification tells you whether the car suits your needs, while tax and MOT status tell you whether it is currently legal to use on the road and how soon you will need to act.

To add a vehicle you need its registration number, so have the number plate to hand for each car you want to compare. The tool is free and does not require an account, which means you can run a comparison at the point of deciding, whether that is at a kitchen table or standing in a seller's driveway.

What the comparison does not show

The comparison is a record check, not an inspection. It will not tell you about accident damage, mileage discrepancies, outstanding finance, stolen status or the general mechanical condition of the car. Those matters sit outside the DVLA and DVSA data the tool draws on, and they need separate checks and a physical inspection.

It also does not value the vehicle or predict its running costs. If you want to understand what the tax on a shortlisted car is likely to cost you, the car tax calculator is the appropriate next step rather than the comparison itself.

What to look for when comparing

Read the entries against each other rather than in isolation. The most useful signals are the ones that differ from what you expected.

• Mismatched details. If the specification shown does not match what the seller described, ask why before going further.
• A short remaining MOT. A test expiring soon means an immediate cost and possible repair bill shortly after purchase.
• Tax that has run out. A vehicle with lapsed tax cannot legally be driven on the road, and you cannot simply drive it home.
• Differences between similar cars. Two near-identical models can sit in different tax or MOT positions, which affects which one is the better buy.

Where a status looks wrong, verify it directly. You can run an MOT check to see the test history behind the expiry date, and check if a car is taxed to confirm the current position before you rely on it.

The sensible next step

Once a car is shortlisted, confirm the registration details independently with a number plate check so that the vehicle you are looking at is the vehicle the records describe. Then arrange to see the car in person, inspect it properly, and ask the seller to explain anything in the comparison that does not add up. Treat the comparison as the filter that decides which cars are worth a viewing, not as a substitute for the viewing itself.