You Paid but Mistyped Your Number Plate — Why That Parking Charge Shouldn't Stand

It is one of the most infuriating ways to get a parking charge: you paid. You stood at the machine, put in your money or tapped your card, and drove off believing you had done everything right. Weeks later a Parking Charge Notice (PCN) arrives demanding a large sum — because the registration you entered didn't exactly match your plate. This is the "keying error" charge, and if you genuinely paid, it is one of the most winnable appeals there is.

What Went Wrong — and Why It Isn't Your Fault

Many private car parks now run on ANPR (Automatic Number Plate Recognition): cameras log your plate on entry and exit, and the system checks it against the registrations typed into the payment machine or app. If the two don't match character-for-character, the software treats you as if you never paid at all.

The trouble is that the matching is unforgiving and the machines often aren't. In 2025 there were widespread reports of operators issuing thousands of demands — some as high as £170 — to drivers who had paid but couldn't enter their full or correct registration because of "sticky keys" and faulty keypads on the payment terminals. A single wrong or missing character — an O typed as a 0, a jammed key that dropped a digit — was enough to turn a paying customer into a "non-payer" on paper.

Don't Just Pay It

The instinct is to pay and make it go away. Resist it. Where you actually paid for your stay, the operator has suffered no real loss — you bought the parking you used. The leading case on private parking charges, ParkingEye v Beavis [2015] UKSC 67, allows a charge only where it is a proportionate response to a genuine breach. A driver who paid the tariff but fat-fingered a digit on a faulty machine is a world away from someone who never paid at all. Paying the charge is usually treated as accepting it — so if you have grounds, appeal instead.

How the Private Parking Code Strengthens Your Hand

The single Private Parking Code of Practice is tightening the rules operators must follow. Among the protections most relevant to a keying-error charge:

• A mandatory 10-minute grace period, so you can't be penalised for small overstays while you sort out payment.
• A cap keeping most charges to around £100 (reduced for prompt payment), rather than the inflated sums some operators have chased.
• A clear, consistent Appeals Charter and standardised signage, so you know how to challenge a charge and what the rules actually are.

Even during the transition, these principles — proportionality, fair signage, a genuine chance to appeal — are exactly what an independent adjudicator weighs up.

How to Appeal a Keying-Error Charge

• Gather your proof of payment. A card statement, bank app entry, parking-app receipt, or even the time you were on site all show you paid for the stay.
• Explain plainly what happened. You paid the correct tariff and entered your registration in good faith; a keypad fault or a single mistyped character caused the mismatch. Include the exact registration you meant to enter.
• Appeal to the operator first. Many keying-error charges are cancelled at this stage once payment is shown.
• Escalate if they refuse. If the operator is a British Parking Association member, appeal to POPLA; if an IPC member, use the Independent Appeals Service (IAS). Both are free to motorists and binding on the operator.
• Keep it factual. Adjudicators respond to evidence — your payment record plus a clear account of the machine fault is far stronger than an angry letter.

A charge for a plate you mistyped after paying looks intimidating, but it rests on a technicality that works in your favour. You paid. Show that you paid, point to the fault, and there is every reason to expect the charge to be cancelled.

Sources

• Which? and national reporting (2025) on operators issuing charges to drivers who paid but could not enter a full registration due to faulty machines ("sticky keys").
• British Parking Association — single Private Parking Code of Practice (charge cap, 10-minute grace period, Appeals Charter).
• ParkingEye Ltd v Beavis [2015] UKSC 67 — proportionality of private parking charges.