How to work out your real annual mileage
Add up: daily commute × 2 × 220 working days + weekend/leisure driving + long trips. Add 10% for the miles you'll forget about. That number, not a rough guess, goes in the box.
Excess mileage charges
Typically 5-25p per excess mile, depending on car and lender. Premium brands (Audi, BMW, Mercedes) sit at the high end. On a £15p rate, 3,000 excess miles a year for 4 years = £1,800.
The paid-up-mileage option
Most lenders let you increase your annual mileage mid-agreement for a small fee — usually cheaper than paying excess at return. If you realise you're heading over the cap in year 2, contact them.
The HP escape route
HP has no mileage cap and no return inspection. If you cover very high mileage (25,000+/year), HP will almost always work out cheaper overall than PCP on the same car.