Some of you may know of this, some not.
I saw this on Reddit the other day and it works.
I would obviously recommend a full HPi before any vehicle purchase, but this will give you an idea if you want to follow up with a viewing.

Go to Autotrader and sign up for an account (free).

Once activated, go to 'Sell my car' at the top of the home page.

Enter the vehicle reg number & the mileage.

Autotrader will then say 'Getting vehicle details' and will automatically do a 5 point HPi check, just click on this 5 point hpi and it will show what it has passed or what it has failed on.

HPI check? Are you having a laugh? Unless I’m doing something wrong, it tells you nothing that you can’t find anywhere else. In fact, it tells you less than you can find anywhere else. Past: FL2 TD4 HSE Auto
Evoque SD4 Dynamic Lux Auto
Present: Audi A3 S Line.

It tells you if it's been stolen and or on finance,
Can you show me where you can find this for free online?