Documentation is where most private car transactions go wrong. Sellers lose paperwork, buyers don't know what to ask for, and the resulting ambiguity creates legal risk for everyone. For car flippers, clean documentation directly affects resale value — a car with a complete paper trail sells faster and for more money than an identical car with "lost paperwork." Here's exactly what should be in every transaction.
The V5C (Registration Certificate / Logbook)
The V5C is the most important document in a car sale. It records the registered keeper (not necessarily the legal owner), the vehicle's make, model, colour, engine size, and VIN/chassis number. Key checks:
- The VIN on the V5C must match the VIN plate in the engine bay and any etching on the windscreen
- The registered keeper name and address should match the person selling you the car
- Check the "number of previous keepers" — one or two is normal; eight previous keepers on a 6-year-old car raises questions
- Never buy without a V5C, and never let a seller post the V5C to DVLA on your behalf — do it yourself when you own the car
When you buy: the seller fills in the "new keeper" section, tears it off, and gives it to you. The seller then notifies DVLA of the sale. You register the car using your section. Do this online within 24 hours to ensure no charges arrive at the seller's address.
MOT Certificate
The MOT certificate shows the vehicle's most recent test date, any advisories, and the mileage recorded at test. Check it against the DVSA MOT history checker online — compare the mileages across all tests. A drop in recorded mileage between tests is a strong indicator of clocking. An advisory recorded in every MOT for the past 3 years that's never been rectified tells you exactly what maintenance has been deferred.
Service History
Full service history — a stamped service book with receipts — is worth £300–£800 in resale value depending on the car. It gives buyers confidence that the car has been maintained at the manufacturer's recommended intervals. What to verify:
- Are the stamps from franchised dealers or independent garages? Both are fine — either demonstrates regular maintenance
- Do the mileages in the service book match the MOT history mileages?
- Are the service intervals consistent? An 18-month gap where 2 years of mileage was covered suggests missed services
- For timing belt/chain engines, is there a record of the cam belt change at the manufacturer-specified mileage?
HPI Check Certificate
A recent HPI certificate (obtained by the seller or by you independently) confirming: no outstanding finance, no write-off markers, no theft record, and no mileage discrepancies. Never rely on a certificate the seller provides — run your own check for a few pounds from an authorised provider. An HPI certificate is valid on the day of the check; new finance can be registered the day after.
For Dealers and Traders: Additional Documents
If you're selling as a trader, your sale documentation must also include: a clear written description of any known faults or defects; explicit disclosure if the car has a write-off marker; a receipt confirming the agreed sale price, vehicle VIN, and date; and ideally a record of the buyer's identity (for Consumer Rights Act protection in case of a dispute). Keeping a simple purchase and sale ledger from day one protects you against disputes and satisfies HMRC's record-keeping requirements.
Missing Documents: What to Do
A missing V5C is not necessarily a dealbreaker — a replacement can be obtained from DVLA for £25. But it delays transfer of ownership and costs you money. Negotiate the cost off the purchase price. Missing service history and missing MOT certificates are harder to recover — factor the impact on resale value into your offer, or walk away if the margin doesn't compensate for the reduced selling price you'll achieve.