Green Flag One Check vs Car Advert Check at a glance
Two tables, both read off Green Flag One Check’s own site. The first is the job we rank on: what the check does with the records. “No” means nothing on their site describes it, not that they can’t.
| Provider | Reads the advert | MOT advisory analysis | Known faults with costs |
|---|---|---|---|
| Car Advert CheckOur pick | Yes | Yes | Yes |
| Green Flag One Check | No | No | No |
Prices and features checked on 17 September 2026, read off each provider's own site: “No” means nothing on their site describes it. Providers change them; tell us if one has.
| Provider | One full check | Free tier | Data guarantee |
|---|---|---|---|
| Car Advert CheckOur pick | See pricing | Free scan: reads the advert against the DVSA MOT history, verdict, risk score and biggest finding, no card and no password | None stated |
| Green Flag One Check | £9.99 (single check) | None | £30,000 data guarantee on the homepage, with no terms page found |
Prices and features checked on 17 September 2026, read off each provider's own site. Providers change them; tell us if one has.
Where Green Flag One Check beats us
A national breakdown brand at under £10 with salvage-auction history and a stated £30,000 guarantee. It’s the one to buy for a breakdown brand at a budget price with salvage history.
Green Flag is one of the few rivals that publishes comparison pages of its own, against HPI, the AA and carVertical, which tells you the "alternative" question has real traffic. Its pitch is a national breakdown name at a low price with salvage and auction history, which it markets as exclusive, and a guarantee on the homepage. We took it at its word on the guarantee but couldn't find a terms page for it, and the sample report the FAQ promises wasn't anywhere we could find on the site, so there's less to read than on most of its rivals.
What Green Flag's pages don't describe is anything after the lookup. The FAQ notes that some MOT records include advisories, and stops there. Our report reads them all, checks the advert's claims against the car's own record and the known faults for that engine, and turns it into one verdict. Both of us show salvage history where it exists. Only one of us reads what the seller wrote.
What Green Flag One Check describes on its own site
Straight from the pages listed under Sources, with nothing filled in from anywhere else. Where the site didn’t show something, the row says so rather than guessing.
- Free tier
- None described
- One full check
- £9.99 (single check)
- Multi-check or packs
- Three for £19.99; five for £29.99
- Data guarantee
- £30,000 data guarantee on the homepage, with no terms page found
- Sources it names
- DVLA; Police National Computer; finance houses; insurance companies; industry databases; MOT history; UK salvage auction records; no supplier named
What its pages describe beyond the lookup: FAQ notes that some MOT records include advisories; nothing describes analysing them. Salvage and auction history is marketed as exclusive.
Read off Green Flag One Check’s own site on 23 October 2026.
What Car Advert Check does with the same records
Start with what’s the same. Our outstanding finance, theft and write-off lookups come from the same places as everyone else’s: the lenders, the police and the insurers’ write-off register. Nobody holds a private source, and we’re not selling better records than Green Flag One Check.
What’s different is what happens next. A plate lookup stops at the registration. Ours carries on and reads three things no lookup takes in: the advert you’re looking at, the car’s whole DVSA MOT advisory history, and our known-faults database for that model, with what each fault costs to put right. Then it gives you one verdict instead of a page of fields, and outstanding finance, a theft marker or a write-off sends that verdict straight to its highest risk rating, because none of those is something you negotiate around.
Where it earns its keep is a car that comes back clean on the registers. A standard check stops there and the car looks fine. Ours keeps going: if the advert says “full service history”, the MOT record shows the same suspension advisory three years running and the engine is one with a known fault at this age, the report says the description doesn’t match the car’s own record, what the fault would cost, and what to ask before you travel.
What it won’t do: we offer no data guarantee, we can’t see a car’s history from before it came to the UK, we don’t sell a car’s past adverts, and nothing we or anyone else sells can see accident damage that never became a claim or how well a repair was done. Those take your eyes and a ramp.
So which should you run?
You’ve got an advert open and you’re deciding whether it’s worth the drive. Run the free scan on that advert. It reads the wording against the car’s DVSA MOT history and tells you the biggest thing to worry about, with no card and no password.
You’re about to hand money over. Upgrade that report to the Provenance Check. It adds the outstanding finance, theft and write-off records, scores them in with everything else, and includes the Smart Check, so the seller questions and a figure to negotiate with come with it.
You need what Green Flag One Check does that we don’t. Buy it. The section above says what that is, and we’d rather you had the right check than ours.
You lose nothing by starting free: the free report upgrades on the same link with no re-run, so you never paste the advert twice, and if the free scan already says walk away, you’ve saved yourself the rest.