How an instant quote is actually generated
An online valuation is not a person forming a view of your car. It is a pricing engine comparing your reg against retail sales data: what similar cars, by make, model, age and mileage, have been fetching on forecourts. The engine then works backwards from that retail figure, subtracting the platform's margin, the dealer's margin and reconditioning headroom, to arrive at the number on your screen.
That machinery has two consequences for a working vehicle. First, everything the engine cannot see, plate value, a documented trade service regime, a healthy hybrid pack, contributes nothing to the number. Second, everything that frightens a retail buyer, six-figure mileage, hire-and-reward history, subtracts from it hard. A pricing engine built on forecourt comparables can only price your car as a tired retail used car, because that is the only market it knows.
The exclusion lists nobody reads
Underneath the headline claims that every car is welcome, the major platforms publish eligibility rules in their help pages, and the lists are remarkably consistent. Vehicles used for taxi or private hire work are excluded outright on the biggest online selling platforms, alongside categories like driving-school and emergency vehicles. Recorded write-offs are refused. A valid MOT is required, often with weeks of validity remaining, before a car can enter a sale.
There is also a floor most drivers never learn about: platforms screen on age, mileage and expected value, and many will not list older or lower-value vehicles at all, because collecting and moving a cheap car eats the margin that makes the model work. Fail any one of these gates and the screen says not eligible, usually without telling you which gate it was.
The gates are applied before any dealer sees the car. A refusal from an online platform means your vehicle was filtered out by rules, not valued and found wanting.
Why the rules exist: the forecourt problem
None of this is malice. A platform's customers are retail dealers, and a retail dealer who sells an ex-taxi must disclose that history to the consumer, who buys it at a discount and gains comeback rights if it was hidden. Add the reconditioning cost on a high-mileage vehicle and the arithmetic stops working: the dealer cannot retail the car profitably, so the platform saves everyone's time by refusing it at the door.
The same logic runs through dealer part exchange, where paperwork commonly asks you to declare the vehicle was never used for private hire, and through instant-quote pricing, where the taxi history becomes a standing deduction. Every mainstream route funnels toward the same outlet, and that outlet cannot use your car.
The retail-vs-trade value gap on licensed vehicles
Here is the part the eligibility screens never tell you: the retail forecourt is not where licensed vehicles trade anyway. Ex-cabs and ex-PHVs move through a parallel market of fleet operators, rental-fleet dealers, relicensing buyers in other licensing areas, and exporters. In that market, hire-and-reward history is normal provenance rather than a defect, and the mileage question is asked about condition and battery health rather than answered by the odometer alone.
The gap between the two markets is real money. At retail, taxi history and high mileage stack into heavy discounts. At trade, the discount is far smaller, because the buyer is pricing a working tool for a market that understands it. Our comparison of hackney carriage and PHV resale at /blog/hackney-vs-phv-resale-difference walks through how the two halves of the licensed trade hold value differently, and the wider numbers behind the sector are in /blog/uk-taxi-private-hire-market-data-2026.
What a specialist buyer does differently
A specialist trade buyer inverts the platform model. Instead of screening the car against retail rules, a valuer assesses the actual vehicle: condition, service record, plate status, battery health on hybrids, and where in the trade it will sell best. The offer is built from those answers, which is why it can be firm rather than subject to inspection, and why there is no eligibility filter in front of it.
For a driver holding a not eligible message, the practical route is short. The commercial case, the four rejection reasons and what each means for your car, is laid out at /rejected-by-online-buyers. If the story is a lowball on an ex-taxi rather than an outright refusal, /buy-ex-cabs covers why generalist quotes come in low and what a specialist pays attention to instead.
A decision checklist after a rejection
If a platform has just refused your vehicle, work through this before you do anything drastic.
- Identify the gate. Taxi or PHV history, MOT position, a write-off marker, or age and value are behind almost every refusal. Knowing which applies tells you which market your car actually belongs in.
- Do not read the refusal as a valuation. The platform never priced your car. It filtered it.
- Resist the scrap reflex. A structurally sound working vehicle refused by a retail-facing platform usually still has genuine trade value.
- Get a trade offer before you accept anything else. A firm number from a specialist, at /rejected-by-online-buyers or straight into /vehicle-valuation, gives you a benchmark to judge every other figure against.
- Tell the valuer everything. Plate history, mileage, MOT position, finance. A full picture up front is what makes a firm offer possible.